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Citing Sources: What are citations and why should I use them?

What is a citation.

Citations are a way of giving credit when certain material in your work came from another source. It also gives your readers the information necessary to find that source again-- it provides an important roadmap to your research process. Whenever you use sources such as books, journals or websites in your research, you must give credit to the original author by citing the source. 

Why do researchers cite?

Scholarship is a conversation  and scholars use citations not only to  give credit  to original creators and thinkers, but also to  add strength and authority  to their own work.  By citing their sources, scholars are  placing their work in a specific context  to show where they “fit” within the larger conversation.  Citations are also a great way to  leave a trail  intended to help others who may want to explore the conversation or use the sources in their own work.

In short, citations

(1) give credit

(2) add strength and authority to your work

(3) place your work in a specific context

(4) leave a trail for other scholars

"Good citations should reveal your sources, not conceal them. They should honeslty reflect the research you conducted." (Lipson 4)

Lipson, Charles. "Why Cite?"  Cite Right: A Quick Guide to Citation Styles--MLA, APA, Chicago, the Sciences, Professions, and More . Chicago: U of Chicago, 2006. Print.

What does a citation look like?

Different subject disciplines call for citation information to be written in very specific order, capitalization, and punctuation. There are therefore many different style formats. Three popular citation formats are MLA Style (for humanities articles) and APA or Chicago (for social sciences articles).

MLA style (print journal article):  

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles Vol. 49.3 (2003): 179-182.

APA style (print journal article):

Whisenant, W. A. (2003) How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX. Sex Roles , 49 (3), 179-182.

Chicago style (print journal article):

Whisenant, Warren A. "How Women Have Fared as Interscholastic Athletic Administrators Since the Passage of Title IX." Sex Roles 49, no. 3 (2003): 179-182.

No matter which style you use, all citations require the same basic information:

• Author or Creator
• Container (e.g., Journal or magazine, website, edited book)
• Date of creation or publication
• Publisher 

You are most likely to have easy access to all of your citation information when you find it in the first place. Take note of this information up front, and it will be much easier to cite it effectively later.

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• Last Updated: May 1, 2024 12:48 PM
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Citation Styles

What is a Citation?

A citation is positioned within the body of your paper, right after you finish referencing or quoting another author's work. This is known as an inline or in-text citation. At the end of your paper, you will also provide a complete reference. A reference must provide enough information to both identify and locate the original source of the information.

A reference usually includes:

• Name(s) of author(s)
• Title of source (article or chapter title and journal or book title)
• Publication date (if known)
• Page number(s)
• Volume and edition/issue numbers (for books and articles)
• If the content is likely to change over time, include the date you originally accessed the content.

Citation Resources

Style Guide Resources

Check out the U-M Library's comprehensive  Citation Help Research Guide  for examples and formatting tips for APA Style, MLA Style, IEEE Style, and well as other Science Styles. You'll also find guidance on citing government documents, data and statistics, and using bibliography tools. Learn how to manage your citations and get help with the  Manage Citations with Zotero, Mendeley, Endnote Research Guide .  

Many students also rely on PurdueOWL for their various style guides, but be aware that the website has many ads, whereas our Citation Help Research Guide is ad-free.

Related Sources

• Do you have a literature review assignment? Check out this guide for an in depth look at writing an advanced literature review.
•   Beyond Plagiarism  is made up a series of lessons that focus on strategies for finding, citing, analyzing, and quoting source material responsibly.

Tools for Formatting Citations

Having trouble formatting your citations? Use these tools to automatically generate citations for books, journal articles, newspapers and more in APA, MLA, and Chicago styles.

• EasyBib EasyBib is an automatic bibliography and citation generator for MLA citations.
• University of North Carolina Citation Builder This citation generator will format citations in MLA, APA, Chicago, or CSE citation styles.
• ZoteroBib Helps you build a bibliography instantly from any computer or device, without creating an account or installing any software.

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When starting your first research work, you will find that citations play one of the central roles in building originality, credibility, and respect for both your work and intellectual property in general. Understanding what a citation is and how to use it effectively is fundamental for anyone engaging in scholarly writing.

Definition of a Citation

A citation is a formal reference to a source from which information or ideas have been drawn. I t is a way to credit the original author and to provide the readers with the necessary information to find the source themselves. Citations are vital in academic writing as they lend support and credibility to the writer’s own ideas and arguments, and they can be created via a free citation generator .

The Role of Citations in Scholarly Work

Creating citations is an inseparable part of academic writing, primarily serving as a guard against the unethical practice of plagiarizing. Plagiarism is the act of using another person’s work or ideas without giving them due credit, and it is considered a serious offense in the academic world. Citing sources demonstrates that writers respect the original author’s intellectual property and acknowledge their contribution to the field.

Moreover, citations illustrate that the writer has engaged in extensive research, adding depth and credibility to their work. They act as a roadmap, allowing readers to follow the trail of research and thought processes that led to the conclusions drawn in the paper. This transparency contributes to the audience’s understanding and allows them to verify the data and ideas presented, making sure the integrity and reliability of the scholarly discourse. Therefore, citations are essential to maintaining the honesty and trustworthiness of academic communication.

Types of Citations

Understanding the different types of citations is key to crafting well-researched and credible work. Each citation style, whether it’s APA, MLA, or Chicago, serves a specific purpose and follows distinct guidelines that build clarity and uniformity in academic communication. From in-text citations that subtly acknowledge sources within your narrative, to detailed bibliographies that offer a comprehensive overview of your research, mastering these various forms enhances the integrity and impact of your writing.

In-text Citations

In-text citations are integral to most academic writing formats. An example of an in-text citation in APA style is:

> (Smith, 2020).

This format briefly acknowledges the source within the text, typically featuring the author’s last name and the publication year. The purpose of in-text citations is to point the reader towards the more detailed reference list entry, allowing them to easily locate the full source details without cluttering the main text with extensive information.

Reference List Citations

Reference list citations are found at the end of an academic paper and provide comprehensive details about each source. For instance, a typical APA reference list entry might look like:

> Smith, J. (2020). Title of the Work . Publisher.

This format includes the author’s name, publication year, title of the work, and publisher details. The reference list ensures that every source mentioned in the in-text citations is accounted for, with sufficient information for the reader to find the original work.

Footnotes and Endnotes

Footnotes and endnotes serve as supplemental tools for citations or additional comments. An example of a footnote in Chicago style might appear as a superscript number within the text, with the corresponding note at the bottom of the page:

> ¹Smith, Title of the Work , 45.

Footnotes are found at the bottom of the page where the reference is made, while endnotes appear collectively at the end of the chapter or document. They can include full citation details or additional insights related to the content, providing further depth and context to the main text.

Citation Styles and Formats

Common Issues and Mistakes in Citation

In the world of academic writing, navigating the intricacies of citation can often be challenging, and it’s all too easy to stumble into common pitfalls. Incorrect citation format is a frequent error, where writers might mix up the requirements of different citation styles, such as confusing APA with MLA. This can lead to confusion and misinterpretation of the source material. Another common issue is missing information in citations, like omitting the publication date or the publisher’s name. This lack of detail can make it difficult for readers to locate the original sources, thereby affecting the paper’s reliability.

Inconsistency in citation styles throughout a document is another area where writers often err. For instance, using APA style in one section and then inadvertently switching to Chicago style in another can create a disjointed reading experience. Such inconsistencies not only disrupt the flow of your writing but also question its scholarly rigor . To maintain the integrity and credibility of your work, it is crucial to be thorough and consistent in your citation practices, carefully adhering to the rules of the chosen citation style. Remember, in the realm of academic writing, precision, and attention to detail in citations are as important as the content itself.

Citations are more than just formalities. They are a testament to a writer’s integrity, attention to detail, and engagement with the scholarly community. Proper citation practices honor the originality of ideas while building a reliable and verifiable body of knowledge. As such, mastering the art of citation is a key skill in academic writing.

What information should be included in a citation?

A citation should typically include the author’s name, the title of the work, publication date, and other relevant details like the publisher’s name, journal title, volume and issue numbers, and page numbers. For digital sources, URLs or DOIs (Digital Object Identifiers) are also essential.

Can I use online citation generators?

Yes, online citation generators can be used and are quite helpful in automating the citation process. However, it’s important to double-check the generated citations for accuracy, as these tools can sometimes make errors or be outdated in terms of citation style guidelines.

What are the consequences of not citing sources?

Not citing sources can lead to accusations of plagiarism, which is a serious academic offense. It can result in various consequences ranging from loss of credibility and academic penalties to legal repercussions. Proper citation is essential to maintain the integrity and reliability of your work.

Is there a difference between citing books and websites?

Yes, there is a difference in citing books and websites. Book citations typically require the author’s name, book title, publisher, and publication year. Website citations, however, often include the author’s name, title of the web page or article, the name of the website, the publication date, and the URL or DOI.

When do I need to use in-text citations?

In-text citations are used whenever you quote, paraphrase, or refer to information from a source in the body of your text. These citations provide a brief acknowledgment of the source, typically including the author’s last name and publication year, which correspond to a more detailed entry in the reference list or bibliography.

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Basic Principles of Citation

APA Style uses the author–date citation system , in which a brief in-text citation directs readers to a full reference list entry. The in-text citation appears within the body of the paper (or in a table, figure, footnote, or appendix) and briefly identifies the cited work by its author and date of publication. This enables readers to locate the corresponding entry in the alphabetical reference list at the end of the paper.

Each work cited must appear in the reference list, and each work in the reference list must be cited in the text (or in a table, figure, footnote, or appendix).

Both paraphrases and quotations require citations.

The following are guidelines to follow when writing in-text citations:

• Ensure that the spelling of author names and the publication dates in reference list entries match those in the corresponding in-text citations.
• Cite only works that you have read and ideas that you have incorporated into your writing. The works you cite may provide key background information, support or dispute your thesis, or offer critical definitions and data.
• Readers may find a long string of citations difficult to understand, especially if they are using assistive technology such as a screen reader; therefore, include only those citations needed to support your immediate point.
• Cite primary sources when possible, and cite secondary sources sparingly.
• Cite sources to document all facts and figures that you mention that are not common knowledge.
• To cite a specific part of a source , provide an author–date citation for the work plus information about the specific part.
• Even when sources cannot be retrieved (e.g., because they are personal communications ), still credit them in the text (however, avoid using online sources that are no longer recoverable).

Basic principles of citation are covered in the seventh edition APA Style manuals in the Publication Manual Sections 8.1 to 8.36 and the Concise Guide Sections 8.1 to 8.34

Related handouts

• In-Text Citation Checklist (PDF, 227KB)
• Six Steps to Proper Citation (PDF, 112KB)

From the APA Style blog

How to cite your own translations

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Key takeaways from the Psi Chi webinar So You Need to Write a Literature Review

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How to cite a work with a nonrecoverable source

In most cases, nonrecoverable sources such as personal emails, nonarchived social media livestreams (or deleted and unarchived social media posts), classroom lectures, unrecorded webinars or presentations, and intranet sources should be cited only in the text as personal communications.

The “outdated sources” myth

The “outdated sources” myth is that sources must have been published recently, such as the last 5 to 10 years. There is no timeliness requirement in APA Style.

From COVID-19 to demands for social justice: Citing contemporary sources for current events

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Citing classical and religious works

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Academic Writer—APA’s essential teaching resource for higher education instructors

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APA Style webinar on citing works in text

Attend the webinar, “Citing Works in Text Using Seventh Edition APA Style,” on July 14, 2020, to learn the keys to accurately and consistently citing sources in APA Style.

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• Research Process
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• Evaluate Your Info
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• Evaluate, Write & Cite

• is the right thing to do  to give credit to those who had the idea
• shows that you have read and understand  what experts have had to say about your topic
• helps people find the sources  that you used in case they want to read more about the topic
• provides   evidence  for your arguments
• is professional and  standard practice   for students and scholars

What is a Citation?

A citation identifies for the reader the original source for an idea, information, or image that is referred to in a work.

• In the body of a paper, the  in-text citation  acknowledges the source of information used.
• At the end of a paper, the citations are compiled on a  References  or  Works Cited  list. A basic citation includes the author, title, and publication information of the source. 

From:  Lemieux  Library,  University  of Seattle 

Why Should You Cite?

Quoting Are you quoting two or more consecutive words from a source? Then the original source should be cited and the words or phrase placed in quotes. 

Paraphrasing If an idea or information comes from another source,  even if you put it in your own words , you still need to credit the source.  General vs. Unfamiliar Knowledge You do not need to cite material which is accepted common knowledge. If in doubt whether your information is common knowledge or not, cite it. Formats We usually think of books and articles. However, if you use material from web sites, films, music, graphs, tables, etc. you'll also need to cite these as well.

Plagiarism is presenting the words or ideas of someone else as your own without proper acknowledgment of the source. When you work on a research paper and use supporting material from works by others, it's okay to quote people and use their ideas, but you do need to correctly credit them. Even when you summarize or paraphrase information found in books, articles, or Web pages, you must acknowledge the original author.

Citation Style Help

Helpful links:

• MLA ,  Works Cited : A Quick Guide (a template of core elements)
• CSE  (Council of Science Editors)

For additional writing resources specific to styles listed here visit the  Purdue OWL Writing Lab

Citation and Bibliography Resources

• How to Write an Annotated Bibliography
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What Are Citations?

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Last updated April 2018

Why Are Citations Important?

What Does a Citation Look Like?

A citation is typically found in two places:, in-text citations.

Reference Lists/Bibliographies

Authors use in-text citations after they have paraphrased, summarized, quoted or otherwise used another author’s work. Examples of in-text citations include parentheses, footnotes or endnotes.

Reference Lists

A reference list includes information on all of the sources an author used. It can also be called a bibliography or works cited. Each item in the list includes information such as title, author and publication date. A reference list is usually listed at the end of a paper with the exception of footnotes which are at the bottom of each page.

Reading a Citation

Knowing how to read a citation in a reference list or bibliography will help you identify different types of sources that an author used in their research. You can use a reference list from another researcher to find related sources on your topic, or to find counterpoints to your research. Let’s look at citations for three common types of sources:

Reading Citations: Article Citations

A citation for an article can include:.

Why is this important?

The journal title is often what is listed in library catalogs.

How do you know if it is an article?

The presence of two titles (article and journal) are the biggest clue that this is an article. Volume Number and Issue Number are also big clues as books will not have those pieces in a citation.

Reading Citations: Book Citations

A citation for a book can include:.

Year, edition, format, and publisher help distinguish between versions.

How do you know if it is a book?

Reading Citations: Website Citations

A citation for a website can include:.

To find and verify a website, you need to know the URL. Since websites change frequently, knowing the date accessed is similar to knowing a publication date.

How do you know if it is a website?

The date accessed and the presence of a URL are the biggest clues that you are looking at a citation for a website.

Citation Styles

Different disciplines cite in different ways which means that there are many different citation styles.

Your professor or department will tell you what style to use.

Style guides, manuals and handbooks are available both in print and online.

Citation Guides at the University Libraries

Examples of Citation Styles: Article Citations

Examples of Citation Styles: Book Citations

Knowledge Check

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Research Skills Tutorial

• Turning A Topic Into A Research Question
• Getting Background Information About Your Topic
• Portfolio Activity 1
• Types of Information Sources
• Scholarly, Popular and Trade Information Sources
• Primary, Secondary and Tertiary Information Sources
• Current and Retrospective Information Sources
• Information Sources for Different Audiences and Purposes
• Portfolio Activity 2
• Library Databases vs. the Web
• Creating a Concept Chart
• Boolean Operators
• Refining Results by Date, Peer Review and Document Type
• Advanced Searching
• Advanced Searching with Descriptors
• Descriptor Chaining
• Citation Chaining (or Reference Mining)
• Searching Outside the SUNY Empire Library
• Searching Google
• Portfolio Activity 3
• Understanding Search Results
• Saving Search Results
• Portfolio Activity 4
• Credible Sources
• What Does the Information Source Tell You About Itself?
• Reliability
• Some More About Validity
• Portfolio Activity 5
• What Is Citing?
• What Is a Citation?
• Citation Styles
• Citing Tools and Tips
• Practice Activity 6
• Practice Activity 7 - Final Project

What Is A Citation?

When to cite.

A citation is a reference to the source of information used in your research. Any time you directly quote, paraphrase or summarize the essential elements of someone else's idea in your work, an in-text citation should follow. An in-text citation is a brief notation within the text of your paper or presentation which refers the reader to a fuller notation, or end-of-paper citation , that provides all necessary details about that source of information. Direct quotations should be surrounded by quotations marks and are generally used when the idea you want to capture is best expressed by the source.  Paraphrasing and summarizing involve rewording an essential idea from someone else's work, usually to either condense the point or to make it better fit your writing style. You do not have to cite your own ideas, unless they have been published. And you do not have to cite  common knowledge , or information that most people in your audience would know without having to look it up.

In-Text Citations

In-text citations alert the reader to an idea from an outside source.  

Parenthetical Notes

In MLA and APA styles, in-text citations usually appear as parenthetical notes (sometimes called parenthetical documentation ). They are called parenthetical notes because brief information about the source, usually the author's name, year of publication, and page number, is enclosed in parentheses as follows:  

MLA style: (Smith 263)

APA style: (Smith, 2013, p. 263)  

Parenthetical notes are inserted into the text of the paper at the end of a sentence or paragraph:>

In MLA and APA styles, in-text citations are associated with end-of-paper citations that provide full details about an information source. Note: Different source types and situations require different information within the parentheses. Refer to a style guide for the style you are using for details.

Note Numbers

In Chicago and CSE styles, in-text citations usually appear as superscript numerals, or note numbers , as follows:

These note numbers are associated with full citations that can appear as footnotes (bottom of page), endnotes (end of chapter or paper), or lists of cited references at the end of the paper.  

End-of-Paper Citations

End-of-paper citations, as well as footnotes and endnotes, include  full details about a source of information.  Citations contain different pieces of identifying information about your source depending on what type of source it is. In academic research, your sources will most commonly be articles from scholarly journals, and the citation for an article typically includes:  

• article title
• publication information (journal title, date, volume, issue, pages, etc.)
• DOI (digital object identifier).
• URL of the information source itself
• URL of the journal that published the article

There are many other types of sources you might use, including books, book chapters, films, song lyrics, musical scores, interviews, e-mails, blog entries, art works, lectures, websites and more. To determine which details are required for a citation for a particular source type, find that source type within the style guide for the citation style you are using. At the end of your research paper, full citations should be listed in order according to the citation style you are using:

• In MLA style, this list is called a W orks Cited page.  
• In APA style, it is called a References page.
• In CSE style, it is called a C ited References page.
• And, in Chicago style, there may be both a Notes page and a Bibliography page. 

Citations  In Library Databases

When you search the library's databases for articles or e-books, the list of search results you see is actually a list of full citations. Instead of being formatted according to MLA, APA, CSE, or Chicago style, these citations are formatted according to the database vendor's style. It is up to you to take the source information you find in a library database (or elsewhere) and format it according to the citation style you are using.

Accessibility Note

Please note: If you need to request accommodations with content linked to on this guide, on the basis of a disability, please contact Accessibility Resources and Services by emailing them .  Requests for accommodations should be submitted as early as possible to allow for sufficient planning. If you have questions, please visit the Accessibility Resources and Services website .

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Citing sources: Overview

• Citation style guides

Manage your references

Use these tools to help you organize and cite your references:

• Citation Management and Writing Tools

If you have questions after consulting this guide about how to cite, please contact your advisor/professor or the writing and communication center .

Why citing is important

It's important to cite sources you used in your research for several reasons:

• To show your reader you've done proper research by listing sources you used to get your information
• To be a responsible scholar by giving credit to other researchers and acknowledging their ideas
• To avoid plagiarism by quoting words and ideas used by other authors
• To allow your reader to track down the sources you used by citing them accurately in your paper by way of footnotes, a bibliography or reference list

About citations

Citing a source means that you show, within the body of your text, that you took words, ideas, figures, images, etc. from another place.

Citations are a short way to uniquely identify a published work (e.g. book, article, chapter, web site).  They are found in bibliographies and reference lists and are also collected in article and book databases.

Citations consist of standard elements, and contain all the information necessary to identify and track down publications, including:

• author name(s)
• titles of books, articles, and journals
• date of publication
• page numbers
• volume and issue numbers (for articles)

Citations may look different, depending on what is being cited and which style was used to create them. Choose an appropriate style guide for your needs.  Here is an example of an article citation using four different citation styles.  Notice the common elements as mentioned above:

Author - R. Langer

Article Title - New Methods of Drug Delivery

Source Title - Science

Volume and issue - Vol 249, issue 4976

Publication Date - 1990

Page numbers - 1527-1533

American Chemical Society (ACS) style:

Langer, R. New Methods of Drug Delivery. Science 1990 , 249 , 1527-1533.

IEEE Style:

R. Langer, " New Methods of Drug Delivery," Science , vol. 249 , pp. 1527-1533 , SEP 28, 1990 .

American Psychological Association   (APA) style:

Langer, R. (1990) . New methods of drug delivery. Science , 249 (4976), 1527-1533.

Modern Language Association (MLA) style:

Langer, R. " New Methods of Drug Delivery." Science 249.4976 (1990) : 1527-33.

What to cite

You must cite:

• Facts, figures, ideas, or other information that is not common knowledge

Publications that must be cited include:  books, book chapters, articles, web pages, theses, etc.

Another person's exact words should be quoted and cited to show proper credit 

When in doubt, be safe and cite your source!

Avoiding plagiarism

Plagiarism occurs when you borrow another's words (or ideas) and do not acknowledge that you have done so. In this culture, we consider our words and ideas intellectual property; like a car or any other possession, we believe our words belong to us and cannot be used without our permission.

Plagiarism is a very serious offense. If it is found that you have plagiarized -- deliberately or inadvertently -- you may face serious consequences. In some instances, plagiarism has meant that students have had to leave the institutions where they were studying.

The best way to avoid plagiarism is to cite your sources - both within the body of your paper and in a bibliography of sources you used at the end of your paper.

Some useful links about plagiarism:

• MIT Academic Integrity Overview on citing sources and avoiding plagiarism at MIT.
• Avoiding Plagiarism From the MIT Writing and Communication Center.
• Plagiarism: What It is and How to Recognize and Avoid It From Indiana University's Writing Tutorial Services.
• Plagiarism- Overview A resource from Purdue University.
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Academic Referencing: How to Cite a Research Paper

Learning how to conduct accurate, discipline-specific academic research can feel daunting at first. But, with a solid understanding of the reasoning behind why we use academic citations coupled with knowledge of the basics, you’ll learn how to cite sources with accuracy and confidence.

When it comes to academic research, citing sources correctly is arguably as important as the research itself. "Your instructors are expecting your work to adhere to these professional standards," said Amanda Girard , research support manager of Shapiro Library at Southern New Hampshire University (SNHU).

With Shapiro Library for the past three years, Girard manages the library’s research support services, which includes SNHU’s 24/7 library chat and email support. She holds an undergraduate degree in professional writing and a graduate degree in library and information science. She said that accurate citations show that you have done your research on a topic and are knowledgeable about current ideas from those actively working in the field.

In other words, when you cite sources according to the academic style of your discipline, you’re giving credit where credit is due.

Why Cite Sources?

Citing sources properly ensures you’re following high academic and professional standards for integrity and ethics.

“When you cite a source, you can ethically use others’ research. If you are not adequately citing the information you claim in your work, it would be considered plagiarism ,” said Shannon Geary '16 , peer tutor at SNHU.

Geary has an undergraduate degree in communication  from SNHU and has served on the academic support team for close to 2 years. Her job includes helping students learn how to conduct research  and write academically.

“In academic writing, it is crucial to state where you are receiving your information from,” she said. “Citing your sources ensures that you are following academic integrity standards.”

According to Geary and Girard, several key reasons for citing sources are:

• Access. Citing sources points readers to original sources. If anyone wants to read more on your topic, they can use your citations as a roadmap to access the original sources.
• Attribution. Crediting the original authors, researchers and experts  shows that you’re knowledgeable about current ideas from those actively working in the field and adhering to high ethical standards, said Girard.
• Clarity. “By citing your sources correctly, your reader can follow along with your research,” Girard said.
• Consistency. Adhering to a citation style provides a framework for presenting ideas within similar academic fields. “Consistent formatting makes accessing, understanding and evaluating an author's findings easier for others in related fields of study,” Geary said.
• Credibility. Proper citation not only builds a writer's authority but also ensures the reliability of the work, according to Geary.

Ultimately, citing sources is a formalized way for you to share ideas as part of a bigger conversation among others in your field. It’s a way to build off of and reference one another’s ideas, Girard said.

How Do You Cite an Academic Research Paper?

Any time you use an original quote or paraphrase someone else’s ideas, you need to cite that material, according to Geary.

“The only time we do not need to cite is when presenting an original thought or general knowledge,” she said.

While the specific format for citing sources can vary based on the style used, several key elements are always included, according to Girard. Those are:

• Title of source
• Type of source, such as a journal, book, website or periodical

By giving credit to the authors, researchers and experts you cite, you’re building credibility. You’re showing that your argument is built on solid research.

“Proper citation not only builds a writer's authority but also ensures the reliability of the work,” Geary said. “Properly formatted citations are a roadmap for instructors and other readers to verify the information we present in our work.”

Common Citation Styles in Academic Research

Certain disciplines adhere to specific citation standards because different disciplines prioritize certain information and research styles . The most common citation styles used in academic research, according to Geary, are:

• American Psychological Association, known as APA . This style is standard in the social sciences such as psychology, education and communication. “In these fields, research happens rapidly, which makes it exceptionally important to use current research,” Geary said.
• Modern Language Association, known as MLA . This style is typically used in literature and humanities because of the emphasis on literature analysis. “When citing in MLA, there is an emphasis on the author and page number, allowing the audience to locate the original text that is being analyzed easily,” Geary said.
• Chicago Manual of Style, known as Chicago . This style is typically used in history, business and sometimes humanities. “(Chicago) offers flexibility because of the use of footnotes, which can be seen as less distracting than an in-text citation,” Geary said.

The benefit of using the same format as other researchers within a discipline is that the framework of presenting ideas allows you to “speak the same language,” according to Girard.

How to Ensure Proper Citations

Keeping track of your research as you go is one of the best ways to ensure you’re citing appropriately and correctly based on the style that your academic discipline uses.

“Through careful citation, authors ensure their audience can distinguish between borrowed material and original thoughts, safeguarding their academic reputation and following academic honesty policies,” Geary said.

Some tips that she and Girard shared to ensure you’re citing sources correctly include:

• Keep track of sources as you work. Writers should keep track of their sources every time an idea is not theirs, according to Geary. “You don’t want to find the perfect research study and misplace its source information, meaning you’d have to omit it from your paper,” she said.
• Practice. Even experienced writers need to check their citations before submitting their work. “Citing requires us to pay close attention to detail, so always start your citation process early and go slow to ensure you don’t make mistakes,” said Geary. In time, citing sources properly becomes faster and easier.
• Use an Online Tool . Geary recommends the Shapiro Library citation guide . You can find sample papers, examples of how to cite in the different academic styles and up-to-date citation requirements, along with information and examples for APA, MLA and Chicago style citations.
• Work with a Tutor. A tutor can offer support along with tips to help you learn the process of academic research. Students at SNHU can connect with free peer tutoring through the Academic Support tab in their online courses, though many colleges and universities offer peer tutoring.

Find Your Program

How to cite a reference in academic writing.

A citation consists of two pieces: an in-text citation that is typically short and a longer list of references or works cited (depending on the style used) at the end of the paper.

“In-text citations immediately acknowledge the use of external source information and its exact location,” Geary said. While each style uses a slightly different format for in-text citations that reference the research, you may expect to need the page number, author’s name and possibly date of publication in parentheses at the end of a sentence or passage, according to Geary.

A longer entry listing the complete details of the resource you referenced should also be included on the references or works cited page at the end of the paper. The full citation is provided with complete details of the source, such as author, title, publication date and more, Geary said.

The two-part aspect of citations is because of readability. “You can imagine how putting the full citation would break up the flow of a paper,” Girard said. “So, a shortened version is used (in the text).”

“For example, if an in-text citation reads (Jones, 2024), the reader immediately knows that the ideas presented are coming from Jones’s work, and they can explore the comprehensive citation on the final page,” she said.

The in-text citation and full citation together provide a transparent trail of the author's process of engaging with research.

“Their combined use also facilitates further research by following a standardized style (APA, MLA, Chicago), guaranteeing that other scholars can easily connect and build upon their work in the future,” Geary said.

Developing and demonstrating your research skills, enhancing your work’s credibility and engaging ethically with the intellectual contributions of others are at the core of the citation process no matter which style you use.

A degree can change your life. Choose your program  from 200+ SNHU degrees that can take you where you want to go.

A former higher education administrator, Dr. Marie Morganelli is a career educator and writer. She has taught and tutored composition, literature, and writing at all levels from middle school through graduate school. With two graduate degrees in English language and literature, her focus — whether teaching or writing — is in helping to raise the voices of others through the power of storytelling. Connect with her on LinkedIn .

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Citation Styles

• Citation Basics

What is a Citation?

A citation is the basic information required to identify and locate a specific source, e.g. book, book chapter, article, website, video, etc.

What is a Citation Style?

Different academic disciplines have specific guidelines for organizing material and citing sources. These rules are published as style manuals . While each citation system is distinct, the underlying rationale is the same–to facilitate written communication among members in a scholarly community.

Parts of a Citation *

• Book: Author Name . Title . Publisher, Year. 

Example: Macfarlane, Bruce. Researching with Integrity: The Ethics of Academic Enquiry . Routledge, 2009. 

• Book Chapter: Author Name. “Chapter Title.” Book Title. Editor, Publisher, Year, Chapter Page Numbers.

Example: Tan, Amy. “Yes and No.” The Genius of Language: Fifteen Writers Reflect on Their Mother Tongues, edited by Wendy Lesser, Pantheon Books, 2004, pp. 25-34.

• Journal Article: Author Name . “Article Title.” Journal Title, Volume Number, Issue Number , Year, Article Page Numbers.

Example: Hess, Mickey. “Was Foucault A Plagiarist? Hip-Hop Sampling And Academic Citation.” Computers & Composition, vol. 23, no. 3, 2006, pp. 280-295.

• Website: Author Name. “Title of Page/Work.” Title of Website, Date of Publication, Location.

Example: Calonia, Jennifer. “How to Avoid Plagiarism.” Grammerly Blog, 21 Aug 2019, https://www.grammarly.com/blog/5-most-effective-methods-for-avoiding-plagiarism .

*The order and punctuation of the citation components are dictated by the style you use (above are formatted in MLA).

What is a DOI?

Digital Object Identifiers (DOIs) are unique identifiers that may be assigned to published articles and other works. Their purpose is ensure persistent access to online content. If a DOI is available, you should include it in your citation.

APA: Clark, D. A., & Murphy, W. (2021). The efficacy of a classroom game for teaching APA style citation. Teaching of Psychology , 48 (3), 209–214. https://doi.org/10.1177/0098628320977263

MLA: Clark, Daniel A., and Walter Murphy. “The Efficacy of a Classroom Game for Teaching APA Style Citation.” Teaching of Psychology , vol. 48, no. 3, July 2021, pp. 209–14. Sage Journals , https://doi.org/10.1177/0098628320977263.

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Citing Your Sources

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What is a Citation?

A  citation  is a reference that allows you to acknowledge the sources* you use in a formal academic paper, and enables a reader to locate those sources through the key information it provides.

Citations are placed both in the text and in an organized list at the end of the text. The format of the citations can vary depending on the citation style that is used. If a footnote or endnote system is used, citations can be self-contained without an organized list.

*Source material might come from books, journal articles, speeches, websites, on-line articles, films, government publications, legal proceedings, maps, and so on.

It is important to cite when borrowing the ideas and thoughts of others for several reasons.

Citing sources

• builds credibility in your work by showing you are not alone in your opinions;
• gives you a chance to show that you have thought about and investigated your topic;
• gives your reader the information he or she needs to verify your source or to find more information on the subject; and
• allows you to give credit where credit is due.

Not citing your sources is academically dishonest and may lead to charges of plagiarism.

In addition, citations are integral to scholarly literature. The scholarly literature on a topic is like a huge conversation that can include many experts from around the world and across the centuries. When an individual writer credits his sources, he ties his work to the larger scholarly discourse. Because citations identify intellectual links throughout scholarly literature, they can be helpful not only when writing but also when conducting research.

Citations enable you as a researcher to

• verify the facts and opinions set forth in a piece of writing;
• identify additional sources that may delve more deeply into a subject;
• distinguish the ideas of various experts regarding a specific topic;
• measure the influence of one thinker upon another; and
• trace the evolution of an idea as it passes from scholar to scholar, from culture to culture, and from era to era.
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What Is a Citation?

Definition, Styles, and Examples

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In any research paper, you draw on the work of other researchers and writers, and you must document their contributions by citing your sources, say Diana Hacker and Nancy Sommers in "A Pocket Style Manual, Eighth Edition." Citations, then, are the means by which you credit other researchers and writers when you use their work in your papers. Understanding how to cite sources can be tricky, particularly since there are different styles for writing papers , including the American Psychological Association, Modern Language Association, and Chicago (Turabian) styles. Electronic sources also come with their own specific citation rules in each of these styles. It's important to learn proper citation styles to avoid  plagiarism  in your research papers.

APA Citations

American Psychological Association (APA) style is often used in social sciences and other disciplines. With APA or any of the styles listed in this paper, you need to use a citation if you quote text from another source, paraphrase an author or authors' ideas, or refer to her work, such as a study, original thinking, or even an elegant turn of phrase. When you cite a source, you can't simply repeat most of the words from the work to which you are referring. You have to put the ideas into your own words, or you need to quote the text directly.

There are two parts to citations for APA and other styles: the short-form in line, which directs readers to a full entry at the end of a chapter or book. An in-line citation differs from a footnote, which is a note placed at the bottom of a page. An in-line citation—also called the  in-text citation —is placed within a line of text. To create an in-line citation, cite the name of the author and the date (in parentheses) of the article, report, book, or study, as this example from "A Pocket Style Manual" shows:

Cubuku (2012) argued that for a student-centered approach to work, students must maintain "ownership for thier goals and activities" (p. 64).

Note how you list the page number at the end of the in-text citation in parentheses followed by a period (if it is at the end of a sentence). If there are two authors, list the last name of each, as in:

"According to Donitsa-Schmidt and Zurzovsky (2014), ..."

If there are more than two authors, list the last name of the first author followed by the words "et al.," as in:

Herman et al. (2012) tracked 42 students over a three-year period (p. 49).

At the end of your paper, attach one or more pages titled "References." That section is essentially your biography. Readers of your paper can then turn to the references listing to read the full citations for each of the works you cited. There are actually many variations for references citations depending, for example, on whether you are citing a book, journal article, or newspaper story, or the many different kinds of media, including audio recordings and film.

the most common citation is to books. For such a citation, list the last name of the author, followed by a comma, followed by the first initial(s) of the author(s), followed by a period. You would put the year the book was published in parentheses followed by a period, then the title of the book in italics using sentence case , followed by a comma, the place of publication, followed by a colon, and then the publisher, followed by a period. "A Pocket Style Manual" gives this example:

Rosenberg, T. (2011). Join the club: How peer pressure can transform the world . New York, NY: Norton.​

Though the citations here won't print this way, use a hanging indent for the second and any subsequent lines in each citation. In a hanging indent in APA style, you indent every line after the first.

MLA Citations

MLA style is often used in English and other humanities papers. MLA follows the author-page style for in-text citations, notes Purdue OWL, an excellent citation, grammar, and writing website operated by Purdue University. Purdue gives this example of an in-text citation, which is also called parenthetical citation in MLA style. Note that in MLA style, page numbers don’t typically appear unless the sentence or passage is a direct quote from the original, as is the case here:

Romantic poetry is characterized by the "spontaneous overflow of powerful feelings" (Wordsworth 263).

At the end of the paper, attach a "Works Cited" page or pages, which is equivalent to the "References" section in APA style. "Works Cited" section citations are very similar in MLA and APA style, as in this example of a work with multiple authors from Purdue OWL:

Warner, Ralph, et al.  How to Buy a House in California . Edited by Alayna Schroeder, 12th ed., Nolo, 2009.

Note that you would also use a hanging indent in MLA, but it tends to be a bit shorter; move the second and subsequent lines in by three spaces. Spell out the first name of the author(s) in MLA style; add a comma before "et al."; use title case for the book, journal, or article title; omit the place of publication information; follow the name of the publisher with a comma; and list the date of publication at the end.

Chicago Style Citations

Chicago is the oldest of the three major writing and citation styles in the United States, having begun with the 1906 publication of the first Chicago style guide. For in-text citations, Chicago style, which comes from the "Chicago Manual of Style" from the University of Chicago Press, is pretty simple: the author's last name, date of publication, a comma, and page numbers, all in parentheses, as follows:

(Murav 2011, 219-220)

At the end of the paper, insert a list of references, which in Chicago style is called a bibliography. Books, journals, and other articles are cited in a manner similar to APA and MLA style. List the author's last name, a comma, and the full first name, followed by the title of the book in italics and title case, the place of publication, followed by a colon, followed by the publisher's name, a comma, and the date of publication, all in parentheses, followed by a comma and the page numbers.

Kate L. Turabian, in "A Manual for Writers" (a student-geared version of Chicago style), gives the following example:

Gladwell, Malcolm,  The Tipping Point: How Little Things Can Make a Big Difference  (Boston: Little Brown, 2000), 64-65.

You also use a hanging indent in the bibliography section of a Chicago style paper, with the indent moved in three spaces. For article or journal titles, list the title in regular (not italic) type encased in quotation marks.

Electronic Sources

Electronic source citations are similar to citations of published works except for two issues: You need to include the URL of the source, and a large percentage of online sources may not list an author. 

In APA style, for example, list an online source in the same way you would cite a book or article, except that you need to include the type of information you are accessing (in parentheses), as well as the URL. If the online source lacks a listed author, start with the name of the group or agency providing the information. "A Pocket Manual of Style" provides the following example of an APA electronic source citation:

U.S. Department of Agriculture, Economic Research Service. (2011). Daily intake of nutrients by food source: 2005-08 . ​[Data set]. Retrieved from http:www.ers.usda.gov/data-products/food-consumption-and-nutrient-intakes.aspx.

As with other citations, use a hanging indent for the second, third, and fourth lines of this source. For Chicago style, use the same method as described previously but add the URL, as in this example:

Brown, David. "New Burden of Disease Study Shows World's People Living Longer but with More Disability," Washington Post , December 12, 2012. http://www.washingtonpost.com/.

Note that Chicago style includes only the home-page URL and not the full URL; that can change, however, from one regime to the next.

MLA style used to require you to list the date you accessed the information, but that's no longer the case. To cite an electronic source, use the same style as discussed previously, but replace the period after the date with a comma and then list the URL.

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Home / Guides / Citation Guides / How to Cite Sources

How to Cite Sources

Here is a complete list for how to cite sources. Most of these guides present citation guidance and examples in MLA, APA, and Chicago.

If you’re looking for general information on MLA or APA citations , the EasyBib Writing Center was designed for you! It has articles on what’s needed in an MLA in-text citation , how to format an APA paper, what an MLA annotated bibliography is, making an MLA works cited page, and much more!

MLA Format Citation Examples

The Modern Language Association created the MLA Style, currently in its 9th edition, to provide researchers with guidelines for writing and documenting scholarly borrowings.  Most often used in the humanities, MLA style (or MLA format ) has been adopted and used by numerous other disciplines, in multiple parts of the world.

MLA provides standard rules to follow so that most research papers are formatted in a similar manner. This makes it easier for readers to comprehend the information. The MLA in-text citation guidelines, MLA works cited standards, and MLA annotated bibliography instructions provide scholars with the information they need to properly cite sources in their research papers, articles, and assignments.

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APA Format Citation Examples

The American Psychological Association created the APA citation style in 1929 as a way to help psychologists, anthropologists, and even business managers establish one common way to cite sources and present content.

APA is used when citing sources for academic articles such as journals, and is intended to help readers better comprehend content, and to avoid language bias wherever possible. The APA style (or APA format ) is now in its 7th edition, and provides citation style guides for virtually any type of resource.

Chicago Style Citation Examples

The Chicago/Turabian style of citing sources is generally used when citing sources for humanities papers, and is best known for its requirement that writers place bibliographic citations at the bottom of a page (in Chicago-format footnotes ) or at the end of a paper (endnotes).

The Turabian and Chicago citation styles are almost identical, but the Turabian style is geared towards student published papers such as theses and dissertations, while the Chicago style provides guidelines for all types of publications. This is why you’ll commonly see Chicago style and Turabian style presented together. The Chicago Manual of Style is currently in its 17th edition, and Turabian’s A Manual for Writers of Research Papers, Theses, and Dissertations is in its 8th edition.

Citing Specific Sources or Events

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Additional FAQs

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6 Interesting Citation Facts

The world of citations may seem cut and dry, but there’s more to them than just specific capitalization rules, MLA in-text citations , and other formatting specifications. Citations have been helping researches document their sources for hundreds of years, and are a great way to learn more about a particular subject area.

Ever wonder what sets all the different styles apart, or how they came to be in the first place? Read on for some interesting facts about citations!

1. There are Over 7,000 Different Citation Styles

You may be familiar with MLA and APA citation styles, but there are actually thousands of citation styles used for all different academic disciplines all across the world. Deciding which one to use can be difficult, so be sure to ask you instructor which one you should be using for your next paper.

2. Some Citation Styles are Named After People

While a majority of citation styles are named for the specific organizations that publish them (i.e. APA is published by the American Psychological Association, and MLA format is named for the Modern Language Association), some are actually named after individuals. The most well-known example of this is perhaps Turabian style, named for Kate L. Turabian, an American educator and writer. She developed this style as a condensed version of the Chicago Manual of Style in order to present a more concise set of rules to students.

3. There are Some Really Specific and Uniquely Named Citation Styles

How specific can citation styles get? The answer is very. For example, the “Flavour and Fragrance Journal” style is based on a bimonthly, peer-reviewed scientific journal published since 1985 by John Wiley & Sons. It publishes original research articles, reviews and special reports on all aspects of flavor and fragrance. Another example is “Nordic Pulp and Paper Research,” a style used by an international scientific magazine covering science and technology for the areas of wood or bio-mass constituents.

4. More citations were created on  EasyBib.com  in the first quarter of 2018 than there are people in California.

The US Census Bureau estimates that approximately 39.5 million people live in the state of California. Meanwhile, about 43 million citations were made on EasyBib from January to March of 2018. That’s a lot of citations.

5. “Citations” is a Word With a Long History

The word “citations” can be traced back literally thousands of years to the Latin word “citare” meaning “to summon, urge, call; put in sudden motion, call forward; rouse, excite.” The word then took on its more modern meaning and relevance to writing papers in the 1600s, where it became known as the “act of citing or quoting a passage from a book, etc.”

6. Citation Styles are Always Changing

The concept of citations always stays the same. It is a means of preventing plagiarism and demonstrating where you relied on outside sources. The specific style rules, however, can and do change regularly. For example, in 2018 alone, 46 new citation styles were introduced , and 106 updates were made to exiting styles. At EasyBib, we are always on the lookout for ways to improve our styles and opportunities to add new ones to our list.

Why Citations Matter

Here are the ways accurate citations can help your students achieve academic success, and how you can answer the dreaded question, “why should I cite my sources?”

They Give Credit to the Right People

Citing their sources makes sure that the reader can differentiate the student’s original thoughts from those of other researchers. Not only does this make sure that the sources they use receive proper credit for their work, it ensures that the student receives deserved recognition for their unique contributions to the topic. Whether the student is citing in MLA format , APA format , or any other style, citations serve as a natural way to place a student’s work in the broader context of the subject area, and serve as an easy way to gauge their commitment to the project.

They Provide Hard Evidence of Ideas

Having many citations from a wide variety of sources related to their idea means that the student is working on a well-researched and respected subject. Citing sources that back up their claim creates room for fact-checking and further research . And, if they can cite a few sources that have the converse opinion or idea, and then demonstrate to the reader why they believe that that viewpoint is wrong by again citing credible sources, the student is well on their way to winning over the reader and cementing their point of view.

They Promote Originality and Prevent Plagiarism

The point of research projects is not to regurgitate information that can already be found elsewhere. We have Google for that! What the student’s project should aim to do is promote an original idea or a spin on an existing idea, and use reliable sources to promote that idea. Copying or directly referencing a source without proper citation can lead to not only a poor grade, but accusations of academic dishonesty. By citing their sources regularly and accurately, students can easily avoid the trap of plagiarism , and promote further research on their topic.

They Create Better Researchers

By researching sources to back up and promote their ideas, students are becoming better researchers without even knowing it! Each time a new source is read or researched, the student is becoming more engaged with the project and is developing a deeper understanding of the subject area. Proper citations demonstrate a breadth of the student’s reading and dedication to the project itself. By creating citations, students are compelled to make connections between their sources and discern research patterns. Each time they complete this process, they are helping themselves become better researchers and writers overall.

When is the Right Time to Start Making Citations?

Make in-text/parenthetical citations as you need them.

As you are writing your paper, be sure to include references within the text that correspond with references in a works cited or bibliography. These are usually called in-text citations or parenthetical citations in MLA and APA formats. The most effective time to complete these is directly after you have made your reference to another source. For instance, after writing the line from Charles Dickens’ A Tale of Two Cities : “It was the best of times, it was the worst of times…,” you would include a citation like this (depending on your chosen citation style):

(Dickens 11).

This signals to the reader that you have referenced an outside source. What’s great about this system is that the in-text citations serve as a natural list for all of the citations you have made in your paper, which will make completing the works cited page a whole lot easier. After you are done writing, all that will be left for you to do is scan your paper for these references, and then build a works cited page that includes a citation for each one.

Need help creating an MLA works cited page ? Try the MLA format generator on EasyBib.com! We also have a guide on how to format an APA reference page .

2. Understand the General Formatting Rules of Your Citation Style Before You Start Writing

While reading up on paper formatting may not sound exciting, being aware of how your paper should look early on in the paper writing process is super important. Citation styles can dictate more than just the appearance of the citations themselves, but rather can impact the layout of your paper as a whole, with specific guidelines concerning margin width, title treatment, and even font size and spacing. Knowing how to organize your paper before you start writing will ensure that you do not receive a low grade for something as trivial as forgetting a hanging indent.

Don’t know where to start? Here’s a formatting guide on APA format .

3. Double-check All of Your Outside Sources for Relevance and Trustworthiness First

Collecting outside sources that support your research and specific topic is a critical step in writing an effective paper. But before you run to the library and grab the first 20 books you can lay your hands on, keep in mind that selecting a source to include in your paper should not be taken lightly. Before you proceed with using it to backup your ideas, run a quick Internet search for it and see if other scholars in your field have written about it as well. Check to see if there are book reviews about it or peer accolades. If you spot something that seems off to you, you may want to consider leaving it out of your work. Doing this before your start making citations can save you a ton of time in the long run.

Finished with your paper? It may be time to run it through a grammar and plagiarism checker , like the one offered by EasyBib Plus. If you’re just looking to brush up on the basics, our grammar guides  are ready anytime you are.

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Citation Basics

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• USC Libraries
• Research Guides

Organizing Your Social Sciences Research Paper

• 11. Citing Sources
• Purpose of Guide
• Design Flaws to Avoid
• Independent and Dependent Variables
• Glossary of Research Terms
• Reading Research Effectively
• Narrowing a Topic Idea
• Broadening a Topic Idea
• Extending the Timeliness of a Topic Idea
• Academic Writing Style
• Applying Critical Thinking
• Choosing a Title
• Making an Outline
• Paragraph Development
• Research Process Video Series
• Executive Summary
• The C.A.R.S. Model
• Background Information
• The Research Problem/Question
• Theoretical Framework
• Citation Tracking
• Content Alert Services
• Evaluating Sources
• Primary Sources
• Secondary Sources
• Tiertiary Sources
• Scholarly vs. Popular Publications
• Qualitative Methods
• Quantitative Methods
• Insiderness
• Using Non-Textual Elements
• Limitations of the Study
• Common Grammar Mistakes
• Writing Concisely
• Avoiding Plagiarism
• Footnotes or Endnotes?
• Further Readings
• Generative AI and Writing
• USC Libraries Tutorials and Other Guides
• Bibliography

A citation is a formal reference to a published or unpublished source that you consulted and obtained information from while writing your research paper. It refers to a source of information that supports a factual statement, proposition, argument, or assertion or any quoted text obtained from a book, article, web site, or any other type of material . In-text citations are embedded within the body of your paper and use a shorthand notation style that refers to a complete description of the item at the end of the paper. Materials cited at the end of a paper may be listed under the heading References, Sources, Works Cited, or Bibliography. Rules on how to properly cite a source depends on the writing style manual your professor wants you to use for the class [e.g., APA, MLA, Chicago, Turabian, etc.]. Note that some disciplines have their own citation rules [e.g., law].

Citations: Overview. OASIS Writing Center, Walden University; Research and Citation. The Writing Lab and The OWL. Purdue University; Citing Sources. University Writing Center, Texas A&M University.

Citing Your Sources

Reasons for Citing Sources in Your Research Paper

English scientist, Sir Isaac Newton, once wrote, "If I have seen further, it is by standing on the shoulders of giants.”* Citations support learning how to "see further" through processes of intellectual discovery, critical thinking, and applying a deliberate method of navigating through the scholarly landscape by tracking how cited works are propagated by scholars over time and the subsequent ways this leads to the devarication of new knowledge.

Listed below are specific reasons why citing sources is an important part of doing good research.

• Shows the reader where to find more information . Citations help readers expand their understanding and knowledge about the issues being investigated. One of the most effective strategies for locating authoritative, relevant sources about a research problem is to review materials cited in studies published by other authors. In this way, the sources you cite help the reader identify where to go to examine the topic in more depth and detail.
• Increases your credibility as an author . Citations to the words, ideas, and arguments of scholars demonstrates that you have conducted a thorough review of the literature and, therefore, you are reporting your research results or proposing recommended courses of action from an informed and critically engaged perspective. Your citations offer evidence that you effectively contemplated, evaluated, and synthesized sources of information in relation to your conceptualization of the research problem.
• Illustrates the non-linear and contested nature of knowledge creation . The sources you cite show the reader how you characterized the dynamics of prior knowledge creation relevant to the research problem and how you managed to identify the contested relationships between problems and solutions proposed among scholars. Citations don't just list materials used in your study, they tell a story about how prior knowledge-making emerged from a constant state of creation, renewal, and transformation.
• Reinforces your arguments . Sources cited in your paper provide the evidence that readers need to determine that you properly addressed the “So What?” question. This refers to whether you considered the relevance and significance of the research problem, its implications applied to creating new knowledge, and its importance for improving practice. In this way, citations draw attention to and support the legitimacy and originality of your own ideas and assertions.
• Demonstrates that you "listened" to relevant conversations among scholars before joining in . Your citations tell the reader where you developed an understanding of the debates among scholars. They show how you educated yourself about ongoing conversations taking place within relevant communities of researchers before inserting your own ideas and arguments. In peer-reviewed scholarship, most of these conversations emerge within books, research reports, journal articles, and other cited works.
• Delineates alternative approaches to explaining the research problem . If you disagree with prior research assumptions or you believe that a topic has been understudied or you find that there is a gap in how scholars have understood a problem, your citations serve as the source materials from which to analyze and present an alternative viewpoint or to assert that a different course of action should be pursued. In short, the materials you cite serve as the means by which to argue persuasively against long-standing assumptions promulgated in prior studies.
• Helps the reader understand contextual aspects of your research . Cited sources help readers understand the specific circumstances, conditions, and settings of the problem being investigated and, by extension, how your arguments can be fully understood and assessed. Citations place your line of reasoning within a specific contextualized framework based on how others have studied the problem and how you interpreted their findings in support of your overall research objectives.
• Frames the development of concepts and ideas within the literature . No topic in the social and behavioral sciences rests in isolation from research that has taken place in the past. Your citations help the reader understand the growth and transformation of the theoretical assumptions, key concepts, and systematic inquiries that emerged prior to your engagement with the research problem.
• Underscores sources that were most important to you . Your citations represent a set of choices made about what you determined to be the most important sources for understanding the topic. They not only list what you discovered, but why it matters and how the materials you chose to cite fit within the broader context of your research design and arguments. As part of an overall assessment of the study’s validity and reliability , the choices you make also helps the reader determine what sources of research may have been excluded.
• Provides evidence of interdisciplinary thinking . An important principle of good research is to extend your review of the literature beyond the predominant disciplinary space where scholars have previously examined a topic. Citations provide evidence that you have integrated epistemological arguments, observations, and/or methodological strategies of other disciplines into your paper, thereby demonstrating that you understand the complex, interconnected nature of contemporary research topics.
• Forms the basis for bibliometric analysis of research . Bibliometric analysis is a quantitative method used, for example, to identify and predict emerging trends in research, document patterns of collaboration among scholars, explore the intellectual structure of a specific domain of research, map the development of research within and across disciplines, or identify gaps in knowledge within the literature. Bibliometric data can also be used to visually map relationships among published studies. Citations to books, journal articles, research reports, and other publications represent the raw data used in bibliometric research.
• Reveals possible adherence to the principles of citational justice. Citational justice refers to equity in the inclusion of sources published by authors who are members of marginalized or underrepresented groups that are often under-cited because of their background, community of origin, identity, or location. In so doing, this movement “challenges entrenched hierarchies and biases in knowledge production.” ** Within this context, the sources cited in your paper can help the reader obtain a more inclusive divergency of voices and perspectives about how a research problem can be understood, contextualized, and investigated.
• Supports critical thinking and independent learning . Evaluating the authenticity, reliability, validity, and originality of prior research is an act of interpretation and introspective reasoning applied to assessing whether a source of information will contribute to understanding the problem in ways that are persuasive and align with your overall research objectives. Reviewing and citing prior studies represents a deliberate act of critically scrutinizing each source as part of your overall assessment of how scholars have confronted the research problem.
• Honors the achievements of others . As Susan Blum recently noted, *** citations not only identify sources used, they acknowledge the achievements of scholars within the larger network of research about the topic. Citing sources is a normative act of professionalism within academe and a way to highlight and recognize the work of scholars who likely do not obtain any tangible benefits or monetary value from their research endeavors. Your citations help to validate the work of others.

*Vernon. Jamie L. "On the Shoulder of Giants." American Scientist 105 (July-August 2017): 194.

**Dadze Arthur, Abena and Mary S. Mangai. "The Journal and the Quest for Epistemic Justice." Public Administration and Development 44 (2024): 11.

***Blum, Susan D. "In Defense of the Morality of Citation.” Inside Higher Ed , January 29, 2024.

Aksnes, Dag W., Liv Langfeldt, and Paul Wouters. "Citations, Citation Indicators, and Research Quality: An Overview of Basic Concepts and Theories." Sage Open 9 (January-March 2019): https://doi.org/10.1177/2158244019829575; Blum, Susan Debra. My Word!: Plagiarism and College Culture . Ithaca, NY: Cornell University Press, 2009; Bretag, Tracey., editor. Handbook of Academic Integrity . Singapore: Springer Singapore, 2020; Ballenger, Bruce P. The Curious Researcher: A Guide to Writing Research Papers . 7th edition. Boston, MA: Pearson, 2012; D'Angelo, Barbara J. "Using Source Analysis to Promote Critical Thinking." Research Strategies 18 (Winter 2001): 303-309; Kwon, Diana. “The Rise of Citational Justice.” Nature 603 (March 24, 2022): 568-572; Donthu, Naveen et al. “How to Conduct a Bibliometric Analysis: An Overview and Guidelines.” Journal of Business Research 133 (2021): 285-296; Mauer, Barry and John Venecek. “Scholarship as Conversation.” Strategies for Conducting Literary Research, University of Central Florida, 2021; Öztürk, Oguzhan, Ridvan Kocaman, and Dominik K. Kanbach. "How to Design Bibliometric Research: An Overview and a Framework Proposal." Review of Managerial Science (2024): 1-29; Why Cite? Poorvu Center for Teaching and Learning, Yale University; Citing Information. The Writing Center. University of North Carolina; Harvard Guide to Using Sources. Harvard College Writing Program. Harvard University; Newton, Philip. "Academic Integrity: A Quantitative Study of Confidence and Understanding in Students at the Start of Their Higher Education."  Assessment and Evaluation in Higher Education 41 (2016): 482-497; Referencing More Effectively. Academic Skills Centre. University of Canberra; Using Sources. Yale College Writing Center. Yale University; Vosburgh, Richard M. "Closing the Academic-practitioner Gap: Research Must Answer the “SO WHAT” Question." H uman Resource Management Review 32 (March 2022): 100633; When and Why to Cite Sources. Information Literacy Playlists, SUNY, Albany Libraries.

Structure and Writing Style

Referencing your sources means systematically showing what information or ideas you acquired from another author’s work, and identifying where that information come from . You must cite research in order to do research, but at the same time, you must delineate what are your original thoughts and ideas and what are the thoughts and ideas of others. Citations help achieve this. Procedures used to cite sources vary among different fields of study. If not outlined in your course syllabus or writing assignment, always speak with your professor about what writing style for citing sources should be used for the class because it is important to fully understand the citation style to be used in your paper, and to apply it consistently. If your professor defers and tells you to "choose whatever you want, just be consistent," then choose the citation style you are most familiar with or that is appropriate to your major [e.g., use Chicago style if you are majoring in history; use APA if its an education course; use MLA if it is literature or a general writing course].

GENERAL GUIDELINES

1. Are there any reasons I should avoid referencing other people's work? No. If placed in the proper context, r eferencing other people's research is never an indication that your work is substandard or lacks originality. In fact, the opposite is true. If you write your paper without adequate references to previous studies, you are signaling to the reader that you are not familiar with the literature on the topic, thereby, undermining the validity of your study and your credibility as a researcher. Including references in academic writing is one of the most important ways to demonstrate your knowledge and understanding of how the research problem has been addressed. It is the intellectual packaging around which you present your thoughts, ideas, and arguments to the reader.

2. What should I do if I find out that my great idea has already been studied by another researcher? It can be frustrating to come up with what you believe is a great topic only to find that it's already been thoroughly studied. However, do not become frustrated by this. You can acknowledge the prior research by writing in the text of your paper [see also Smith, 2002], then citing the complete source in your list of references. Use the discovery of prior studies as an opportunity to demonstrate the significance of the problem being investigated and, if applicable, as a means of delineating your analysis from those of others [e.g., the prior study is ten years old and doesn't take into account new variables]. Strategies for responding to prior research can include: stating how your study updates previous understandings about the topic, offering a new or different perspective, applying a different or innovative method of gathering and interpreting data, and/or describing a new set of insights, guidelines, recommendations, best practices, or working solutions.

3. What should I do if I want to use an adapted version of someone else's work? You still must cite the original work. For example, you use a table of statistics from a journal article published in 1996 by author Smith, but you have altered or added new data to it. Reference the revised chart, such as, [adapted from Smith, 1996], then cite the original source in your list of references. You can also use other terms in order to specify the exact relationship between the original source and the version you have presented, such as, "based on data from Smith [1996]...," or "summarized from Smith [1996]...." Citing the original source helps the reader locate where the information was first presented and under what context it was used as well as to evaluate how effectively you applied it to your own research.

4. What should I do if several authors have published very similar information or ideas? You can indicate that the topic, idea, concept, or information can be found in the works of others by stating something similar to the following example: "Though many scholars have applied rational choice theory to understanding economic relations among nations [Smith, 1989; Jones, 1991; Johnson, 1994; Anderson, 2003; Smith, 2014], little attention has been given to applying the theory to examining the influence of non-governmental organizations in a globalized economy." If you only reference one author or only the most recent study, then your readers may assume that only one author has published on this topic, or more likely, they will conclude that you have not conducted a thorough review of the literature. Referencing all relevant authors of prior studies gives your readers a clear idea of the breadth of analysis you conducted in preparing to study the research problem. If there has been a significant number of prior studies on the topic [i.e., ten or more], describe the most comprehensive and recent works because they will presumably discuss and reference the older studies. However, note in your review of the literature that there has been significant scholarship devoted to the topic so the reader knows that you are aware of the numerous prior studies.

5. What if I find exactly what I want to say in the writing of another researcher? In the social sciences, the rationale in duplicating prior research is generally governed by the passage of time, changing circumstances or conditions, or the emergence of variables that necessitate new investigations . If someone else has recently conducted a thorough investigation of precisely the same research problem that you intend to study, then you likely will have to revise your topic, or at the very least, review this literature to identify something new to say about the problem. However, if it is someone else's particularly succinct expression, but it fits perfectly with what you are trying to say, then you can quote from the author directly, referencing the source. Identifying an author who has made the exact same point that you want to make can be an opportunity to validate, as well as reinforce the significance of, the research problem you are investigating. The key is to build on that idea in new and innovative ways. If you are not sure how to do this, consult with a librarian .

6. Should I cite a source even if it was published long ago? Any source used in writing your paper should be cited, regardless of when it was written. However, in building a case for understanding prior research about your topic, it is generally true that you should focus on citing more recently published studies because they presumably have built upon the research of older studies. When referencing prior studies, use the research problem as your guide when considering what to cite. If a study from forty years ago investigated the same topic, it probably should be examined and considered in your list of references because the research may have been foundational or groundbreaking at the time, even if its findings are no longer relevant to current conditions or reflect current thinking [one way to determine if a study is foundational or groundbreaking is to examine how often it has been cited in recent studies using the "Cited by" feature of Google Scholar ]. However, if an older study only relates to the research problem tangentially or it has not been cited in recent studies, then it may be more appropriate to list it under further readings .

7. Can I cite unusual and non-scholarly sources in my research paper? The majority of the citations in a research paper should be to scholarly [a.k.a., academic; peer-reviewed] studies that rely on an objective and logical analysis of the research problem based on empirical evidence that reliably supports your arguments. However, any type of source can be considered valid if it brings relevant understanding and clarity to the topic. This can include, for example, non-textual elements such as photographs, maps, or illustrations. A source can include materials from special or archival collections, such as, personal papers, manuscripts, business memorandums, the official records of an organization, or digitized collections. Citations can also be to unusual items, such as, an audio recording, a transcript from a television news program, a unique set of data, or a social media post. The challenge is knowing how to cite unusual and non-scholarly sources because they often do not fit within consistent citation rules of books or journal articles. Given this, consult with a librarian if you are unsure how to cite a source.

NOTE:   In any academic writing, you are required to identify which ideas, facts, thoughts, concepts, or declarative statements are yours and which are derived from the research of others. The only exception to this rule is information that is considered to be a commonly known fact [e.g., "George Washington was the first president of the United States"] or a statement that is self-evident [e.g., "Australia is a country in the Global South"]. Appreciate, however, that any "commonly known fact" or self-evidencing statement is culturally constructed and shaped by specific social and aesthetical biases . If you have any doubt about whether or not a fact is considered to be widely understood knowledge, provide a supporting citation, or, ask your professor for clarification about whether the statement should be cited.

Ballenger, Bruce P. The Curious Researcher: A Guide to Writing Research Papers . 7th edition. Boston, MA: Pearson, 2012; Blum, Susan Debra. My Word!: Plagiarism and College Culture . Ithaca, NY: Cornell University Press, 2009; Bretag, Tracey., editor. Handbook of Academic Integrity . Singapore: Springer Singapore, 2020; Carlock, Janine. Developing Information Literacy Skills: A Guide to Finding, Evaluating, and Citing Sources . Ann Arbor, MI: University of Michigan Press, 2020; Harvard Guide to Using Sources. Harvard College Writing Program. Harvard University; How to Cite Other Sources in Your Paper. The Structure, Format, Content, and Style of a Journal-Style Scientific Paper. Department of Biology. Bates College; Lunsford, Andrea A. and Robert Connors; The St. Martin's Handbook . New York: St. Martin's Press, 1989; Mills, Elizabeth Shown. Evidence Explained: Citing History Sources from Artifacts to Cyberspace . 3rd edition. Baltimore, MD: Genealogical Publishing Company, 2015; Research and Citation Resources. The Writing Lab and The OWL. Purdue University; Writing Tutorial Services, Center for Innovative Teaching and Learning. Indiana University; Why Cite? Poorvu Center for Teaching and Learning, Yale Univeraity.

Other Citation Research Guides

The following USC Libraries research guide can help you properly cite sources in your research paper:

• Citation Guide

The following USC Libraries research guide offers basic information on using images and media in research:

Listed below are particularly well-done and comprehensive websites that provide specific examples of how to cite sources under different style guidelines.

• Purdue University Online Writing Lab
• Southern Cross University Harvard Referencing Style
• University of Wisconsin Writing Center

This is a useful guide concerning how to properly cite images in your research paper.

• Colgate Visual Resources Library, Citing Images

This guide provides good information on the act of citation analysis, whereby you count the number of times a published work is cited by other works in order to measure the impact of a publication or author.

Measuring Your Impact: Impact Factor, Citation Analysis, and other Metrics: Citation Analysis [Sandy De Groote, University of Illinois, Chicago]

Automatic Citation Generators

The links below lead to systems where you can type in your information and have a citation compiled for you. Note that these systems are not foolproof so it is important that you verify that the citation is correct and check your spelling, capitalization, etc. However, they can be useful in creating basic types of citations, particularly for online sources.

• BibMe -- APA, MLA, Chicago, and Turabian styles
• DocsCite -- for citing government publications in APA or MLA formats
• EasyBib -- APA, MLA, and Chicago styles
• Son of Citation Machine -- APA, MLA, Chicago, and Turabian styles

NOTE:   Many companies that create the research databases the USC Libraries subscribe to, such as ProQuest , include built-in citation generators that help take the guesswork out of how to properly cite a work. When available, you should always utilize these features because they not only generate a citation to the source [e.g., a journal article], but include information about where you accessed the source [e.g., the database].

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Citation Examples for APA, MLA, and Chicago Style Guides

You may think citing sources for research papers is confusing . . . because it absolutely is! It’s one thing to memorize the precise format for your sources’ information, but it’s another thing to know the precise formats required by APA, MLA, and Chicago style guides.

Because different styles have different citation formats, we thought showing you some citation examples in research papers would help you learn to tell the difference. Feel free to use this guide as a resource to help you get the perfect citation, no matter what style you use.

Cite your sources with confidence Grammarly helps you avoid plagiarism Write with Grammarly

How to use citation examples in research

In-text citations vs. full citations, parenthetical citations vs. narrative citations, apa citation examples, apa in-text citation examples, apa citation examples: book.

• APA citation examples: Journal Article

APA citation examples: Website

Apa citation examples: video, apa citation examples: ai, mla citation examples, mla in-text citation examples, mla citation examples: book.

• MLA citation examples: Journal Article

MLA citation examples: Website

Mla citation examples: video, mla citation examples: ai, chicago citation examples, chicago in-text citation examples, chicago citation examples: book.

• Chicago citation examples: Journal Article

Chicago citation examples: Website

Chicago citation examples: video, chicago citation examples: ai, citation examples for multiple authors, apa citation examples for more than one author, mla citation examples for more than one author, chicago citation examples for more than one author.

In academic writing like research papers , you must cite your source for each piece of information that’s not your own . In informal writing like personal essays, you are your own source, so you don’t need a citation. But for writing that uses information from outside books, articles, websites, videos, or even AI, citations are necessary.

The tricky part is that each style has its own particular way of citing sources. Most academic papers are written in one of the three main styles:

• Chicago format

Each of these styles has different rules for what information to include in citations, as well as unique guidelines for particulars like capitalization, the use of italics, and the order in which the information comes. (For more details, read our direct comparison of MLA vs. APA .)

In this blog post, we share citation examples of each style for different types of sources. But first, let’s talk a little about the different types of citations you’ll be using in formal writing.

The two main types of citations are in-text citations and full citations.

In-text citations appear in the body text of the paper and provide the bare minimum of information to identify the source. These usually include the author’s name and sometimes a page number or publication date. They can be either parenthetical or narrative, which we explain below. Alternatively, if you’re using Chicago style, you have the option to use footnotes as in-text citations.

Full citations appear in the bibliography at the end of the text and contain all the relevant information from a source. The idea is that, if your reader is interested in learning more about one of your sources, they can find it in the full citation. Full citations are written in a particular way, and different styles have their own rules for what information goes where.

In APA, the bibliography is called a reference page ; in MLA, it’s called a works cited page . Only Chicago uses the term “bibliography.”

In-text citations can be either parenthetical citations or narrative citations. A parenthetical citation puts a brief credit in parentheses after the related piece of information. Here’s an in-text citation example in APA:

Not all experiments use a placebo group because “if your patients are ill, you shouldn’t be leaving them untreated simply because of your own mawkish interest in the placebo effect” (Goldacre, 2008, p. 60) .

A narrative citation, on the other hand, gives credit in the body text itself, such as by mentioning the author by name. Typically, any information not included in the text is still placed in an abbreviated parenthetical citation afterward.

Not all experiments use a placebo group because, as Ben Goldacre wrote , “if your patients are ill, you shouldn’t be leaving them untreated simply because of your own mawkish interest in the placebo effect” (2008, p. 60) .

Our in-text citation examples below are for standard parenthetical citations. Just remember if you mention the author, page, or year in the main text, you can remove it from the parenthetical citation.

In-text citations in APA use what’s called the author-date style , which includes the author’s last name and the year of publication, separated with commas.

If citing a specific piece of information or a direct quote, also include the location, such as a page number or timestamp. Use the abbreviations p. for page , pp. for pages , and paras. for paragraphs . For general information, such as a concept discussed throughout the source, no location is needed.

(Last Name, Year, p. #)

(Goldacre, 2008, p. 60)

To cite a book in APA , you need the author’s name, year of publication, book title, and publisher. The author’s name is written as “last name, first name initial,” as in “Shakespeare, W.” Titles use sentence-style capitalization, which means only the first letter of the first word in the title (and subtitle, if applicable) are capitalized. If the book edition is relevant, place it in parentheses after the title.

Last name, First name initial. (Year of publication). Title . Publisher.

Goldacre, B. (2008). Bad science. Fourth Estate.

APA citation examples: Journal article

Citing an article in APA requires the author’s last name and first initial; the full date of publication, including month and day if applicable; and the titles of both the article and the journal/periodical, as well as the page number. Note that, unlike MLA and Chicago styles, APA doesn’t abbreviate months in citations.

Last name, First name initial. (Year, Month Day of publication). Article title. Magazine name, volume (issue), page range. DOI

Cardanay, A. (2016, January 12). Illustrating motion, music, and story. General Music Today, 29 (3), 25–29. doi:10.1177/1048371315626498

To cite a website in APA , follow the same format you use to cite journal articles, except without volume, issue, or page numbers. Website citations in APA include a URL, however. If the website represents a print publication, italicize the title. If not, italicize the article name.

Last name, First name initial. (Year, Month Day of publication). Title of article, post, or page. Website. URL

Hudson, J. (2023, November 12). What Taylor Swift can teach us about leadership. Forbes . https://www.forbes.com/sites/jameshudson/2023/11/12/what-taylor-swift-can-teach-us-about-leadership/

To cite YouTube in APA , as well as any online video, you need to include both the uploader’s real name and username, the date posted, the video title, the website name, and the URL. You also need to include the word “Video” in brackets after the video title to show what kind of source it is.

Real last name, First initial. [Username]. (Year, Month Day). Video title [Video]. Website. URL.

Desmond, W. [TED-Ed]. (2019, December 19). The philosophy of cynicism [Video]. YouTube. https://www.youtube.com/watch?v=Utzym1I_BiY

According to the APA website, AI citations in APA should be treated as an “algorithm’s output.” You cite the company that built it as the author, the name of the AI as the title, and the year you interacted with it as the date of publication. You should also include the version you used and a descriptor like “large language model” in brackets, followed by the URL.

Company. (Year). AI Name (version) [Descriptor]. URL

OpenAI. (2023). ChatGPT (March 14 version) [Large language model]. https://chat.openai.com/chat

For MLA, in-text citations use only the author’s last name and the page number or timestamp, without abbreviations or commas.

(Last name #)

(Goldacre 60)

To cite a book in MLA , you need the author’s name, book title, place of publication, publisher’s name, and the date of publication. The author’s name is inverted, with the last name coming before the first name. Most parts are separated by periods, except for the author’s names and publication information, which are separated by commas. Titles use title capitalization, which capitalizes the first letter of each major word.

Last name, First name. Book Title . Place of publication, Publisher, publication date.

Goldacre, Ben. Bad Science . London, Fourth Estate, 2008.

MLA citation examples: Journal article

Citing an article in MLA is similar to citing a journal article in other styles, although MLA uses abbreviations for volume (vol.) and issue number (no.), as well as pages (pp.). If you found the article online, you also need to include the database name in italics and the URL or DOI.

Last name, First name. “Title of article.” Journal , vol. #, no. #, Day Month Year of publication, pp. #–#. Database , DOI or URL.

Cardanay, Audrey. “Illustrating Motion, Music, and Story.” General Music Today , vol. 29, no. 3, 2016, pp. 25–29. Academic Search Premier , doi:10.1177/1048371315626498.

To cite a website in MLA , include the page or article title in quotes and the name of the website in italics. In addition to the publication date and URL, you also need to mention the date you visited the website, using the word “Accessed.”

Last name, First name. “Page or Article Title.” Website , Day Month Year of publication, URL. Accessed Day Month Year.

Hudson, James. “What Taylor Swift Can Teach Us about Leadership.” Forbes , 12 Nov. 2023, https://www.forbes.com/sites/jameshudson/2023/11/12/what-taylor-swift-can-teach-us-about-leadership/. Accessed 13 Nov. 2023.

Citing YouTube in MLA is similar to citing videos in APA, although the information goes in different places. Additionally, you need either the creator’s real name or username, but not both.

Username or Last name, First name. “Title.” Website , Day Month Year, URL.

Desmond, William. “The Philosophy of Cynicism.” YouTube , 19 Dec. 2019, https://www.youtube.com/watch?v=Utzym1I_BiY.

AI citations in MLA ignore the author altogether and use the AI prompt (what you typed into the chat) as the title. MLA uses “containers” for sources within larger works, and for AI the container is the name of the AI. You also need the version, company (as the publisher), date accessed, and URL.

“Entered text” prompt. AI Name , version, Company, Day Month Year, URL.

“Citation examples for research” prompt. ChatGPT , GPT-4, OpenAI, 15 Nov. 2023, chat.openai.com/chat.

In Chicago, you can choose either parenthetical citations or footnotes for in-text citations. Chicago’s parenthetical citations also use an author-date style just like APA citations; however, there is no comma between the author and year (although there is a comma between the year and the location). Chicago citations do not use abbreviations for page numbers.

(Last Name Year, #)

(Goldacre 2008, 60)

Citing a book in Chicago uses the author’s name, book title, place of publication, publisher, and year of publication. You also include the edition, but only if it’s relevant. The author’s name is inverted, and the title uses title capitalization.

Last Name, First Name. Book Title: Subtitle . Edition (if applicable). Place of Publication: Publisher, Year.

Goldacre, Ben. Bad Science . London: Fourth Estate, 2008.

Chicago citation examples: Journal article

Citing an article in Chicago is most similar to citing an article in MLA, including the type of information to include and the use of abbreviations. Pay attention to the citation examples to see the correct order and punctuation to use; note that in Chicago the volume number directly follows the journal title and is not separated by a comma or preceded by the word “vol.”

Last name, First name. “Article title.” Journal vol. #, no. # (Year): #–#. Database or article URL.

Cardanay, Audrey. “Illustrating Motion, Music, and Story.” General Music Today 29, no. 3 (2016): 25–29. Academic Search Premier.

Compared to citing a website in other styles, citing a website in Chicago is more straightforward. Include all the relevant information, put the article or page title in quotations, and don’t worry about italics or the date you visited (unless the website does not have a publication date; in that case, include the date you accessed the site where you would normally put the publication date).

Last name, First name. “Article or Page Title.” Website, Month Day, Year of publication. URL.

Hudson, James. “What Taylor Swift Can Teach Us about Leadership.” Forbes, Nov. 12, 2023. https://www.forbes.com/sites/jameshudson/2023/11/12/what-taylor-swift-can-teach-us-about-leadership/

To cite YouTube in Chicago , you need to include all the standard information, such as the creator’s name, the title of the video, and the website that hosts it, as well as the date and URL. Unlike other formats, Chicago also requires the total video length written in XX:XX format. You also need to mention the source format (“video”) after naming the website.

Uploader. “Title.” Website and format, duration. Month Day, Year of publication. URL.

TED-Ed. “The Philosophy of Cynicism.” YouTube video, 5:25. Dec. 19, 2019. https://www.youtube.com/watch?v=Utzym1I_BiY.

AI citations in Chicago work differently than in other styles; Chicago considers AI conversations as “personal communication” because they’re non-retrievable—meaning other people can’t access the same conversation you had. Consequently, do not include AI chatbots in the bibliography ; mention them only as personal communications if necessary.

However, you still need to use in-text citations for AI in Chicago. For parenthetical citations, you can use the name of the AI as the author and when you had the conversation as the publication date.

APA, MLA, and Chicago formats all have different guidelines for citing more than one author. Here are some quick reference tips on how each does it:

Each author in an APA citation is written in the format of Last name, First Initial. Place authors in the same order as the publication lists them, which may not necessarily be alphabetical. Separate each name with a comma and add an ampersand (&) before the last author’s name.

Marieb, E., & Keller, S. (2018). Essentials of human anatomy & physiology (12th ed.) . Pearson.

In-text citations in APA for two authors use both authors’ last names, connected with an ampersand. For more than two authors, use only the first author’s last name and the phrase et al.

(Marieb & Keller, 2018)

(Marieb et al., 2018)

If an MLA citation has two authors, list them both in the full citation but invert only the first name. Separate them with a comma and the word and .

Cohn, Rachel, and David Levithan. Dash & Lily’s Book of Dares . Ember Publishing House, 2011.

In-text citations use both last names with and .

(Cohn and Levitation 55)

For more than two authors, use only the first author’s name and the phrase et al. in both the full and in-text citation.

Heffernan, James, et al. Writing: A College Handbook . New York, W. W. Norton & Company, 2000.

(Heffernan et al. 27)

In the bibliography, Chicago citations list the names of up to ten authors, separated by commas and with the word and before the last author. For more than ten authors, list only the first seven and then add et al . Only the first name is inverted.

Gyatso, Tenzin, and Howard Cutler. The Art of Happiness: A Handbook for Living . Norwalk: Easton Press, 1998.

In-text citations list the last names of up to three authors, separated by commas (if there are more than two), and the word and before the final name. For four or more authors, use only the first author’s last name and the phrase et al .

(Gyatso and Cutler 1998)

(Gyatso et al. 1998)

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• The Basics of In-Text Citation | APA & MLA Examples

The Basics of In-Text Citation | APA & MLA Examples

Published on March 14, 2022 by Jack Caulfield . Revised on February 28, 2024.

An in-text citation is a short acknowledgement you include whenever you quote or take information from a source in academic writing. It points the reader to the source so they can see where you got your information.

In-text citations most commonly take the form of short parenthetical statements indicating the author and publication year of the source, as well as the page number if relevant.

We also offer a free citation generator and in-depth guides to the main citation styles.

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Table of contents

What are in-text citations for, when do you need an in-text citation, types of in-text citation, frequently asked questions about in-text citations.

The point of an in-text citation is to show your reader where your information comes from. Including citations:

• Avoids plagiarism by acknowledging the original author’s contribution
• Allows readers to verify your claims and do follow-up research
• Shows you are engaging with the literature of your field

Academic writing is seen as an ongoing conversation among scholars, both within and between fields of study. Showing exactly how your own research draws on and interacts with existing sources is essential to keeping this conversation going.

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The AI-powered Citation Checker helps you avoid common mistakes such as:

• Missing commas and periods
• Incorrect usage of “et al.”
• Ampersands (&) in narrative citations
• Missing reference entries

An in-text citation should be included whenever you quote or paraphrase a source in your text.

Quoting means including the original author’s words directly in your text, usually introduced by a signal phrase . Quotes should always be cited (and indicated with quotation marks), and you should include a page number indicating where in the source the quote can be found.

Paraphrasing means putting information from a source into your own words. In-text citations are just as important here as with quotes, to avoid the impression you’re taking credit for someone else’s ideas. Include page numbers where possible, to show where the information can be found.

However, to avoid over-citation, bear in mind that some information is considered common knowledge and doesn’t need to be cited. For example, you don’t need a citation to prove that Paris is the capital city of France, and including one would be distracting.

Different types of in-text citation are used in different citation styles . They always direct the reader to a reference list giving more complete information on each source.

Author-date citations (used in APA , Harvard , and Chicago author-date ) include the author’s last name, the year of publication, and a page number when available. Author-page citations (used in MLA ) are the same except that the year is not included.

Both types are divided into parenthetical and narrative citations. In a parenthetical citation , the author’s name appears in parentheses along with the rest of the information. In a narrative citation , the author’s name appears as part of your sentence, not in parentheses.

Note: Footnote citations like those used in Chicago notes and bibliography are sometimes also referred to as in-text citations, but the citation itself appears in a note separate from the text.

An in-text citation is an acknowledgement you include in your text whenever you quote or paraphrase a source. It usually gives the author’s last name, the year of publication, and the page number of the relevant text. In-text citations allow the reader to look up the full source information in your reference list and see your sources for themselves.

At college level, you must properly cite your sources in all essays , research papers , and other academic texts (except exams and in-class exercises).

Add a citation whenever you quote , paraphrase , or summarize information or ideas from a source. You should also give full source details in a bibliography or reference list at the end of your text.

The exact format of your citations depends on which citation style you are instructed to use. The most common styles are APA , MLA , and Chicago .

Check if your university or course guidelines specify which citation style to use. If the choice is left up to you, consider which style is most commonly used in your field.

• APA Style is the most popular citation style, widely used in the social and behavioral sciences.
• MLA style is the second most popular, used mainly in the humanities.
• Chicago notes and bibliography style is also popular in the humanities, especially history.
• Chicago author-date style tends to be used in the sciences.

Other more specialized styles exist for certain fields, such as Bluebook and OSCOLA for law.

The most important thing is to choose one style and use it consistently throughout your text.

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Caulfield, J. (2024, February 28). The Basics of In-Text Citation | APA & MLA Examples. Scribbr. Retrieved August 26, 2024, from https://www.scribbr.com/citing-sources/in-text-citation-styles/

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APA Citation Style

Citation examples.

• Paper Format
• Style and Grammar Guidelines
• Citation Management Tools
• What's New in the 7th Edition?
• APA Style References Guidelines from the American Psychological Association
• APA Style (OWL - Online Writing Lab, Purdue University)
• Common Reference Examples Handout
• Journal Article
• Magazine Article
• Newspaper Article
• Edited Book Chapter
• Dictionary Entry
• Government Report
• YouTube Video
• Facebook Post
• Webpage on a Website
• Supplemental Reference Examples
• Archival Documents and Collections

Parenthetical citations:  (Grady et al., 2019; Jerrentrup et al., 2018)

Narrative citations:  Grady et al. (2019) and Jerrentrup et al. (2018)

• If a journal article has a DOI, include the DOI in the reference.
• If the journal article does not have a DOI and is from an academic research database, end the reference after the page range (for an explanation of why, see the  database information  page). The reference in this case is the same as for a print journal article.
• Do not include database information in the reference unless the journal article comes from a database that publishes original, proprietary content, such as UpToDate (see an example on the  database information  page).
• If the journal article does not have a DOI but does have a URL that will resolve for readers (e.g., it is from an online journal that is not part of a database), include the URL of the article at the end of the reference.
• If the journal article has an article number instead of a page range, include the article number instead of the page range (as shown in the Jerrentrup et al. example).

Parenthetical citations:  (Rabinowitz, 2019; Sapolsky, 2017)

Narrative citations:  Rabinowitz (2019) and Sapolsky (2017)

• If the book includes a DOI, include the DOI in the reference after the publisher name.
• Do not include the publisher location.
• If the book does not have a DOI and comes from an academic research database, end the book reference after the publisher name. Do not include  database information  in the reference. The reference in this case is the same as for a print book.

Parenthetical citations:  (Schaefer & Shapiro, 2019; Schulman, 2019)

Narrative citations:  Schaefer and Shapiro (2019) and Schulman (2019)

• If a magazine article has a DOI, include the DOI in the reference.
• If the magazine article does not have a DOI and is from an academic research database, end the reference after the page range. Do not include  database information  in the reference. The reference in this case is the same as for a print magazine article.
• If the magazine article does not have a DOI but does have a URL that will resolve for readers (e.g., it is from an online magazine that is not part of a database), include the URL of the article at the end of the reference.
• If the magazine article does not have volume, issue, and/or page numbers (e.g., because it is from an online magazine), omit the missing elements from the reference (as in the Schulman example).

Parenthetical citation:  (Carey, 2019)

Narrative citation:  Carey (2019)

• If the newspaper article is from an academic research database, end the reference after the page range. Do not include  database information  in the reference. The reference in this case is the same as for a print newspaper article.
• If the newspaper article has a URL that will resolve for readers (e.g., it is from an online newspaper), include the URL of the article at the end of the reference.
• If the newspaper article does not have volume, issue, and/or page numbers (e.g., because it is from an online newspaper), omit the missing elements from the reference, as shown in the example.
• If the article is from a news website (e.g., CNN, HuffPost)—one that does not have an associated daily or weekly newspaper—use the format for a  webpage on a website  instead.

Parenthetical citation:  (Aron et al., 2019)

Narrative citation:  Aron et al. (2019)

• If the edited book chapter includes a DOI, include the chapter DOI in the reference after the publisher name.
• If the edited book chapter does not have a DOI and comes from an academic research database, end the edited book chapter reference after the publisher name. Do not include  database information  in the reference. The reference in this case is the same as for a print edited book chapter.
• Do not create references for chapters of authored books. Instead, write a reference for the whole book and cite the chapter in the text if desired (e.g., Kumar, 2017, Chapter 2).

Parenthetical citation:  (Merriam-Webster, n.d.)

Narrative citation:  Merriam-Webster (n.d.)

• Because entries in  Merriam-Webster’s Dictionary  are updated over time and are not archived, include a  retrieval date  in the reference.
• Merriam-Webster is both the author and the publisher, so the name appears in the author element only to avoid repetition.
• To quote a dictionary definition, view the pages on quotations and  how to quote works without page numbers  for guidance. Additionally, here is an example:  Culture  refers to the “customary beliefs, social forms, and material traits of a racial, religious, or social group” (Merriam-Webster, n.d., Definition 1a).

Parenthetical citation:  (National Cancer Institute, 2019)

Narrative citation:  National Cancer Institute (2019)

The specific agency responsible for the report appears as the author. The names of parent agencies not present in the  group author name  appear in the source element as the publisher. This creates concise in-text citations and complete reference list entries.

Parenthetical citation:  (Harvard University, 2019)

Narrative citation:  Harvard University (2019)

• Use the name of the account that uploaded the video as the author.
• If the account did not actually create the work, explain this in the text if it is important for readers to know. However, if that would mean citing a source that appears unauthoritative, you might also look for the author’s YouTube channel, official website, or other social media to see whether the same video is available elsewhere.

Parenthetical citations:  (APA Databases, 2019; Gates, 2019)

Narrative citations:  APA Databases (2019) and Gates (2019)

• Present the name of the individual or group author the same as you would for any other reference. Then provide the Twitter handle (beginning with the @ sign) in square brackets, followed by a period.
• Provide the first 20 words of the tweet as the title. Count a URL, a hashtag, or an emoji as one word each, and include them in the reference if they fall within the first 20 words.
• If the tweet includes an image, a video, a poll, or a thumbnail image with a link, indicate that in brackets after the title: [Image attached], [Video attached], [Thumbnail with link attached].
• The same format used for Twitter is also used for Instagram.  

Parenthetical citation:  (News From Science, 2019)

Narrative citation:  News From Science (2019)

• Provide the first 20 words of the Facebook post as the title. Count a URL or other link, a hashtag, or an emoji as one word each, and include them in the reference if they fall within the first 20 words. 
• If a status update includes images, videos, thumbnail links to outside sources, or content from another Facebook post (such as when sharing a link), indicate that in square brackets.

Parenthetical citations:  (Fagan, 2019; National Institute of Mental Health, 2018; Woodyatt, 2019; World Health Organization, 2018)

Narrative citations:  Fagan (2019), National Institute of Mental Health (2018), Woodyatt (2019), and World Health Organization (2018)

• Provide as specific a  date  as is available on the webpage. This might be a year only; a year and month; or a year, month, and day.
• Italicize the title of a webpage.
• When the author of the webpage and the publisher of the website are the same, omit the publisher name to avoid repetition (as in the World Health Organization example).
• When contents of a page are meant to be updated over time but are not archived, include a  retrieval date  in the reference (as in the Fagan example).
• Use the webpage on a website format for articles from news websites such as CNN and HuffPost (these sites do not have associated daily or weekly newspapers). Use the  newspaper article category  for articles from newspaper websites such as  The New York Times  or  The Washington Post .
• Create a reference to an open educational resources (OER) page only when the materials are available for download directly (i.e., the materials are on the page and/or can be downloaded as PDFs or other files). If you are directed to another website, create a reference to the specific webpage on that website where the materials can be retrieved. Use this format for material in any OER repository, such as OER Commons, OASIS, or MERLOT.
• Do not create a reference or in-text citation for a whole website. To mention a website in general, and not any particular information on that site, provide the name of the website in the text and include the URL in parentheses. For example, you might mention that you used a website to create a survey.

The following supplemental example references are mention in the  Publication Manual:

• retracted journal or magazine article
• edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM)
• edition of the International Statistical Classification of Diseases and Related Health Problems (ICD)
• religious work
• annotated religious work

Archival document and collections are not presented in the  APA Publication Manual, Seventh Edition . This content is available only on the APA Style website .  This guidance has been expanded from the 6th edition.

Archival sources include letters, unpublished manuscripts, limited-circulation brochures and pamphlets, in-house institutional and corporate documents, clippings, and other documents, as well as such nontextual materials as photographs and apparatus, that are in the personal possession of an author, form part of an institutional collection, or are stored in an archive such as the Archives of the History of American Psychology at the University of Akron or the APA Archives. For any documents like these that are available on the open web or via a database (subscription or nonsubscription), follow the reference templates shown in Chapter 10 of the Publication Manual.

The general format for the reference for an archival work includes the author, date, title, and source. The reference examples shown on this page may be modified for collections requiring more or less specific information to locate materials, for different types of collections, or for additional descriptive information (e.g., a translation of a letter). Authors may choose to list correspondence from their own personal collections, but correspondence from other private collections should be listed only with the permission of the collector.

Keep in mind the following principles when creating references to archival documents and collections:

• As with any reference, the purpose is to direct readers to the source, despite the fact that only a single copy of the document may be available and readers may have some difficulty actually seeing a copy.
• Include as much information as is needed to help locate the item with reasonable ease within the repository. For items from collections with detailed finding aids, the name of the collection may be sufficient; for items from collections without finding aids, more information (e.g., call number, box number, file name or number) may be necessary to help locate the item.
• If several letters are cited from the same collection, list the collection as a reference and provide specific identifying information (author, recipient, and date) for each letter in the in-text citations (see Example 3).
• Use square brackets to indicate information that does not appear on the document.
• Use “ca.” (circa) to indicate an estimated date (see Example 5).
• Use italics for titles of archival documents and collections; if the work does not have a title, provide a description in square brackets without italics.
• Separate elements of the source (e.g., the name of a repository, library, university or archive, and the location of the university or archive) with commas. End the source with a period.
• If a publication of limited circulation is available in libraries, the reference may be formatted as usual for published material, without the archival source.
• Note that private letters (vs. those in an archive or repository) are considered personal communications and cited in the text only.

1. Letter from a repository

Frank, L. K. (1935, February 4). [Letter to Robert M. Ogden]. Rockefeller Archive Center (GEB Series 1.3, Box 371, Folder 3877), Tarrytown, NY, United States.

• Parenthetical citation: (Frank, 1935)
• Narrative citation: Frank (1935)
• Because the letter does not have a title, provide a description in square brackets.

2. Letter from a private collection

Zacharius, G. P. (1953, August 15). [Letter to William Rickel (W. Rickel, Trans.)]. Copy in possession of Hendrika Vande Kemp.

• Parenthetical citation: (Zacharius, 1953)
• Narrative citation: Zacharius (1953)
• In this example, Hendrika Vande Kemp is either the author of the paper or the author of the paper has received permission from Hendrika Vande Kemp to cite a letter in Vande Kemp’s private collection in this way. Otherwise, cite a private letter as a  personal communication .

3. Collection of letters from an archive

Allport, G. W. (1930–1967). Correspondence. Gordon W. Allport Papers (HUG 4118.10), Harvard University Archives, Cambridge, MA, United States.

• Parenthetical citation: (Allport, 1930–1967)
• Narrative citation: Allport (1930–1967)

To cite specific letters in the text, provide the author and range of years as shown in the reference list entry, plus details about who wrote the specific letter to whom and when the specific letter was written.

• Parenthetical citation: (Allport, 1930–1967, G. Boring to Allport, December 26, 1937)
• Narrative citation: Allport (1930–1967, Allport to G. Boring, March 1, 1939)
• Use the parenthetical citation format to cite a letter that E. G. Boring wrote to Allport because Allport is the author in the reference. Use either the parenthetical or narrative citation format to cite letters that Allport wrote.

4. Unpublished papers, lectures from an archive or personal collection

Berliner, A. (1959). Notes for a lecture on reminiscences of Wundt and Leipzig. Anna Berliner Memoirs (Box M50), Archives of the History of American Psychology, University of Akron, Akron, OH, United States.

• Parenthetical citation: (Berliner, 1959)
• Narrative citation: Berliner (1959)

5. Archival/historical source for which the author and/or date is known or is reasonably certain but not stated on the document

Allport, A. (presumed). (ca. 1937). Marion Taylor today—by the biographer [Unpublished manuscript]. Marion Taylor Papers, Schlesinger Library, Radcliffe College, Cambridge, MA, United States.

• Parenthetical citation: (Allport, ca. 1937)
• Narrative citation: Allport (ca. 1937)
• Because the author is reasonably certain but not stated on the document, place the word “presumed” in parentheses after the name, followed by a period.
• Because the date is reasonably certain but not stated on the document, the abbreviation “ca.” (which stands for “circa”) appears before the year in parentheses.

6. Archival source with group author

Subcommittee on Mental Hygiene Personnel in School Programs. (1949, November 5–6). Meeting of Subcommittee on Mental Hygiene Personnel in School Programs. David Shakow Papers (M1360), Archives of the History of American Psychology, University of Akron, Akron, OH, United States.

• Parenthetical citation: (Subcommittee on Mental Hygiene Personnel in School Programs, 1949)
• Narrative citation: Subcommittee on Mental Hygiene Personnel in School Programs (1949)

7. Interview recorded and available in an archive

Smith, M. B. (1989, August 12). Interview by C. A. Kiesler [Tape recording]. President’s Oral History Project, American Psychological Association, APA Archives, Washington, DC, United States.

• Parenthetical citation: (Smith, 1989)
• Narrative citation: Smith (1989)
• For interviews and oral histories recorded in an archive, list the interviewee as the author. Include the interviewer’s name in the description.

8. Transcription of a recorded interview, no recording available

Sparkman, C. F. (1973). An oral history with Dr. Colley F. Sparkman/Interviewer: Orley B. Caudill. Mississippi Oral History Program (Vol. 289), University of Southern Mississippi, Hattiesburg, MS, United States.

• Parenthetical citation: (Sparkman, 1973)
• Narrative citation: Sparkman (1973)

9. Newspaper article clipping, historical, in personal collection

Psychoanalysis institute to open. (1948, September 18). [Clipping from an unidentified Dayton, OH, United States, newspaper]. Copy in possession of author.

• Parenthetical citation: (“Psychoanalysis Institute to Open,” 1948)
• Narrative citation: “Psychoanalysis Institute to Open” (1948)
• Use this format only if you are the person who is in possession of the newspaper clipping.

10. Historical publication of limited circulation

Sci-Art Publishers. (1935). Sci-Art publications [Brochure]. Roback Papers (HUGFP 104.50, Box 2, Folder “Miscellaneous Psychological Materials”), Harvard University Archives, Cambridge, MA, United States.

• Parenthetical citation: (Sci-Art Publishers, 1935)
• Narrative citation: Sci-Art Publishers (1935)

11. Archived photographs, no author and no title

[Photographs of Robert M. Yerkes]. (ca. 1917–1954). Robert Mearns Yerkes Papers (Box 137, Folder 2292), Manuscripts and Archives, Yale University Library, New Haven, CT, United States.

• Parenthetical citation: ([Photographs of Robert M. Yerkes], ca. 1917–1954)
• Narrative citation: [Photographs of Robert M. Yerkes] (ca. 1917–1954)
• Because the archived photographs do not have a title, provide a bracketed description instead.
• Because the archived photographs do not have an author, move the bracketed description to the author position of the reference.

12. Microfilm

U.S. Census Bureau. (1880). 1880 U.S. census: Defective, dependent, and delinquent classes schedule: Virginia [Microfilm]. NARA Microfilm Publication T1132 (Rolls 33–34), National Archives and Records Administration, Washington, DC, United States.

• Parenthetical citation: (U.S. Census Bureau, 1880)
• Narrative citation: U.S. Census Bureau (1880)

Read the full APA guidelines on citing ChatGPT 

OpenAI. (2023).  ChatGPT  (Mar 14 version) [Large language model].  https://chat.openai.com/chat

• Parenthetical citation:  (OpenAI, 2023)
• Narrative citation:  OpenAI (2023)

Author:  The author of the model is OpenAI.

Date:  The date is the year of the version you used. Following the template in Section 10.10, you need to include only the year, not the exact date. The version number provides the specific date information a reader might need.

Title:  The name of the model is “ChatGPT,” so that serves as the title and is italicized in your reference, as shown in the template. Although OpenAI labels unique iterations (i.e., ChatGPT-3, ChatGPT-4), they are using “ChatGPT” as the general name of the model, with updates identified with version numbers.

The version number is included after the title in parentheses. The format for the version number in ChatGPT references includes the date because that is how OpenAI is labeling the versions. Different large language models or software might use different version numbering; use the version number in the format the author or publisher provides, which may be a numbering system (e.g., Version 2.0) or other methods.

Bracketed text  is used in references for additional descriptions when they are needed to help a reader understand what’s being cited. References for a number of common sources, such as journal articles and books, do not include bracketed descriptions, but things outside of the typical peer-reviewed system often do. In the case of a reference for ChatGPT, provide the descriptor “Large language model” in square brackets. OpenAI describes ChatGPT-4 as a “large multimodal model,” so that description may be provided instead if you are using ChatGPT-4. Later versions and software or models from other companies may need different descriptions, based on how the publishers describe the model. The goal of the bracketed text is to briefly describe the kind of model to your reader.

Source:  When the publisher name and the author name are the same, do not repeat the publisher name in the source element of the reference, and move directly to the URL. This is the case for ChatGPT. The URL for ChatGPT is  https://chat.openai.com/chat . For other models or products for which you may create a reference, use the URL that links as directly as possible to the source (i.e., the page where you can access the model, not the publisher’s homepage).

What to include and what to exclude

Works included in a reference list.

The reference list provides a reliable way for readers to identify and locate the works cited in a paper. APA Style papers generally include reference lists, not  bibliographies.

In general, each work cited in the text must appear in the reference list, and each work in the reference list must be cited in the text. Check your work carefully before submitting your manuscript or course assignment to ensure no works cited in the text are missing from the reference list and vice versa, with only the following exceptions.

Works Excluded From a Reference List

There are a few kinds of works that are not included in a reference list. Usually a work is not included because readers cannot recover it or because the mention is so broad that readers do not need a reference list entry to understand the use.

Information on works included in a reference list is covered in Sections 2.12 and 8.4 of the  APA Publication Manual, Seventh Edition

*This guidance has been expanded from the 6th edition.*

• Personal communications  such as emails, phone calls, or text messages are cited in the text only, not in the reference list, because readers cannot retrieve personal communications.
• General mentions of whole websites, whole periodicals, and common software and apps in the text do not require in-text citations or reference list entries because the use is broad and the source is familiar.
• The source of an epigraph does not usually appear in the reference list unless the work is a scholarly book or journal. For example, if you open the paper with an inspirational quotation by a famous person, the source of the quotation does not appear in the reference list because the quotation is meant to set the stage for the work, not substantiate a key point.   
• Quotations from research participants in a study you conducted can be presented and discussed in the text but do not need citations or reference list entries. Citations and reference list entries are not necessary because the quotations are part of your original research. They could also compromise participants’ confidentiality, which is an ethical violation.
• References included in a meta-analysis, which are marked with an asterisk in the reference list, may be cited in the text (or not) at the author’s discretion. This exception is relevant only to authors who are conducting a meta-analysis.

DOIs and URLs

The DOI or URL is the final component of a reference list entry. Because so much scholarship is available and/or retrieved online, most reference list entries end with either a DOI or a URL.

• A DOI is a unique alphanumeric string that identifies content and provides a persistent link to its location on the internet. DOIs can be found in database records and the reference lists of published works.
• A URL specifies the location of digital information on the internet and can be found in the address bar of your internet browser. URLs in references should link directly to the cited work when possible.

Follow these guidelines for including DOIs and URLs in references:

• Include a DOI for all works that have a DOI, regardless of whether you used the online version or the print version.
• If a print work does not have a DOI, do not include any DOI or URL in the reference.
• If an online work has both a DOI and a URL, include only the DOI.
• For works without DOIs from websites (not including academic research databases), provide a URL in the reference (as long as the URL will work for readers).
• For works without DOIs from most  academic research databases , do not include a URL or database information in the reference because these works are widely available. The reference should be the same as the reference for a print version of the work.
• For works from databases that publish original, proprietary material available only in that database (such as the UpToDate database) or for works of limited circulation in databases (such as monographs in the ERIC database), include the name of the database or archive and the URL of the work. If the URL requires a login or is session-specific (meaning it will not resolve for readers), provide the URL of the database or archive home page or login page instead of the URL for the work. See the page on including  database information in references  for more information. 
• If the URL is no longer working or no longer provides readers access to the content you intend to cite, follow the guidance for works with  no source .
• Other alphanumeric identifiers such as the International Standard Book Number (ISBN) and the International Standard Serial Number (ISSN) are not included in APA Style references.

Follow these guidelines to format DOIs and URLs:

• Present both DOIs and URLs as hyperlinks (i.e., beginning with “http:” or “https:”).
• Because a hyperlink leads readers directly to the content, it is not necessary to include the words “Retrieved from” or “Accessed from” before a DOI or URL.
• It is acceptable to use either the default display settings for hyperlinks in your word-processing program (e.g., usually blue font, underlined) or plain text that is not underlined.
• Leave links live if the work is to be published or read online.
• Follow the current recommendations of the International DOI Foundation to format DOIs in the reference list, which as of this publication is as follows:

https://doi.org/ xxxxx

• The string “https://doi.org/” is a way of presenting a DOI as a link, and “xxxxx” refers to the DOI number.
• The preferred format of the DOI has changed over time. Although older works use previous formats (e.g., “http:/dx.doi.org/” or “doi:” or “DOI:” before the DOI number), in your reference list, standardize DOIs into the current preferred format for all entries. For example, use  https://doi.org/10.1037/a0040251  in your reference even though that article, published in 2016, presented the number in an older format.
• Copy and paste the DOI or URL from your web browser directly into your reference list to avoid transcription errors. Do not change the capitalization or punctuation of the DOI or URL. Do not add line breaks manually to the hyperlink; it is acceptable if your word-processing program automatically adds a break or moves the hyperlink to its own line.
• Do not add a period after the DOI or URL because this may interfere with link functionality.

When a DOI or URL is long or complex, you may use shortDOIs or shortened URLs if desired.

• Use the  shortDOI service  provided by the International DOI Foundation to create shortDOIs. A work can have only one DOI and only one shortDOI; the shortDOI service will either produce a new shortDOI for a work that has never had one or retrieve an existing shortDOI.
• Some websites provide their own branded shortened URLs, and independent URL shortening services are available as well. Any shortened URL is acceptable in a reference as long as you check the link to ensure that it takes you to the correct location.
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APA (American Psychological Association) style is most frequently used within the social sciences, in order to cite various sources. This APA Citation Guide provides the general format for in-text citations and the reference page. For more information, please consult the Publication Manual of the American Psychological Association , 7th ed.

In APA style, two citations are used to cite a source:

• A short citation used in the text (called the in-text citation ).
• A full citation (called the reference ) in the reference list at the end of a paper.

The in-text citation is a short citation that is placed next to the text being cited. The in-text citation lets the reader know that the information came from the cited source. The reference list entry provides complete details of a source and is shown at the end of a document.

In order to properly cite a source in APA style, you must have both citation types in your paper. Every in-text citation has a reference list entry. Every reference list entry has at least one (maybe more) corresponding in-text citation.

In-text citations

The basic elements needed for an in-text citation are the author’s surname and the publication year . Sometimes, page numbers are also included, especially when quotes are mentioned in the text. In-text citations are mentioned in the text in two ways: as a narrative citation or a parenthetical citation.

Narrative citations are incorporated into the text and act as a part of the sentence. Usually, narrative citations use the author’s name in the text and the publication year is enclosed in parenthesis after the name. An example of a narrative citation for one author is given below:

Barbarin (2013) examined socioemotional learning in African boys.

Parenthetical

Parenthetical citations add the author’s name and the publication year at the end of the sentence in parenthesis. An example of a parenthetical citation is given below:

Inhibition and working memory in young children were studied extensively (Aase, 2014).

When are page numbers are included?

Page numbers are referred to within in-text citations when quotes are used. Examples of both narrative citations and parenthetical citations are given below.

Ahmed (2004, p. 44)

Ahmed (2004, pp. 53–56)

Parenthetical:

(Ahmed, 2004, p. 44)

(Ahmed, 2004, pp. 53–56)

Examples of in-text citations

Here are a few examples of in-text citations for a different number of authors:

Use the surname of the author in in-text citations. Use a comma before the publication year in parenthetical citations.

Narrative: 

Bucher (2018)

Parenthetical: 

(Bucher, 2018)

Two authors

Separate the author surnames with an “and” in narrative citations. Use an ampersand symbol (&) in parenthetical citations.

Popescu and Pennacchiotti (2010)

(Popescu & Pennacchiotti, 2010)

Three or more authors

Use the first author surname name followed by et al.

van Dijck et al. (2018)

(van Dijck et al., 2018)

Group author

Treat the group author similar to how you would treat author names.

Auger Collaboration (2003)

(Auger Collaboration, 2018)

If there is no author for the source, use the source title in place of the author’s name. In general, sources with no author appear as parenthetical citations.

When you add such in-text citations, you will either italicize the text or place it in quotations. If the source title is italicized in the reference list entry, italicize the title in the in-text citation. If the title is not italicized, place it in quotation marks.

Parenthetical, book:

( Nothing here , 1997)

Parenthetical, journal article:

(“Examination of parrotfish impact on coral reefs,” 2018)

Reference list entries

Reference list entries are also called full citations. There are four main details that most reference list entries have:

• The author field.
• The publication year.
• The title of the work ( italicized or in “quotation marks”).
• The source from where the reference can be obtained (e.g., URL, DOI, etc.).

Depending on the source type, you will also need additional details like volume number, publication title, contributors, medium, etc.

Examples of reference list entries

Below are a few examples of different types of reference entries along with their templates. The examples given are for one author. Note that “F” and “M” in the templates denote the first and the middle initials of an author’s name.

The title of the book is set in italics and sentence case.

Author Surname, F. M. (Publication Year). Title of the book . Publisher.

Ahmed, S. (2014). The cultural politics of emotion . Edinburgh University Press.

Journal article

The title of the article is in sentence case. The first word of a subtitle is capitalized. The journal title and the volume number are set in italics. If an article has a DOI it should always be included. Use “https://doi.org/” before the DOI. If there is no DOI for an online journal, include the URL instead. Do not use a period after the DOI or URL.

Author Surname, F. M. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range. URL or DOI

Collins, R. (2004). Rituals of solidarity and security in the wake of terrorist attack. Sociological Theory, 22 (1), 53–87. https://doi.org/10.1111/j.1467-9558.2004.00204.x

Newspaper or magazine article

Newspaper and magazine articles take the same style. The title of the article is in plain text and sentence case; the title of the newspaper or the magazine is set in italics. Follow the format given in the template and example for setting the date, month, and year.

Surname, F. M. (Date of publication). Title of the article. Title of the Newspaper or Magazine . URL

TNN. (2021, July 18). Parents have a habit of comparing kids to others but you don’t need to. The Times of India . https://timesofindia.indiatimes.com//home/sunday-times/parents-have-a-habit-of-comparing-kids-to-others-but-you-dont-need-to/articleshow/84507857.cms

The webpage title is in plain text, while the Website name is set in italics. Follow the format given in the template and example for setting the date, month, year, and URL.

Author or Organization Name. (Year, Month Day of Publication ). Webpage title. Title of the Website. URL

Lamberth, H. (2021, August 12). Binge drinking is problem drinking: How to get back in control. PSYCOM . https://www.psycom.net/binge-drinking-problem-drinking

YouTube video

The video title is set in sentence case and italicized. The first word after a colon is capitalized. The word “Video” is enclosed in brackets after the video title. This is followed followed by the word “YouTube.” Finally, the link is given. Note that a period is not given after the URL.

Uploader’s name, F. (Year, Month Day Published). Video title [Video]. YouTube. URL

Ananta, P. (2021, February 21). APJ Abdul Kalam inspirational quotes [Video]. YouTube. https://www.youtube.com/watch?v=pjfL51RFL2k

Reference entries for different number of authors

The number of authors in the source decides how the author name(s) will be set in the references list. Here, you will see many journal references with different numbers of authors.

List the author name followed by the publication year.

Author Surname, F. M. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range.

Spitka, T. (2017). Mediating among mediators: Building a consensus in multilateral interventions. International Negotiation, 23 , 1–30.

Separate the author names by an ampersand. Use a comma between the first author’s initial and the ampersand symbol.

Author Surname, F. M., & Author Surname, F. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range. DOI or URL

Bernstein, B., & Solomon, J. (1999). Pedagogy, identity and the construction of a theory of symbolic control: Basil Bernstein questioned by Joseph Solomon. British Journal of Sociology of Education, 20 (2), 265–279. https://doi:10.1080/01425699995443

When you add two organizations in the author field, do not use a comma before the ampersand.

Organization 1 & Organization 2. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range. DOI or URL

American Psychological Association & American Psychological Society. (2020). Psychology of children. Journal of Child Psychology, 34 (23), 1–12.

3–20 authors

List all author names. Do not forget to insert an “ampersand” before the last author. The example given below is for three authors.

Author Surname, F. M., Author Surname, F. M., & Author Surname, F. M. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range. DOI or URL

Pyysiäinen, J., Halpin, D., & Guilfoyle, A. (2017). Neoliberal governance and ‘responsibilization’ of agents: Reassessing the mechanisms of responsibility-shift in neoliberal discursive environments. Distinktion: Journal of Social Theory, 18 (2), 215–235. https://doi:10.1080/1600910X.2017.1331858

More than 20 authors

List the names of the first 19 authors followed by an ellipsis. Add the final author name after the ellipsis but without the ampersand symbol before the last author name.

Author Surname1, F. M., Author Surname2, F. M., Author Surname3, F. M., Author Surname4, F. M., Author Surname5, F. M., Author Surname6, F. M., Author Surname7, F. M., Author Surname8, F. M., Author Surname9, F. M., Author Surname10, F. M., Author Surname11, F. M., Author Surname12, F. M., Author Surname13, F. M., Author Surname14, F. M., Author Surname15, F. M., Author Surname16, F. M., Author Surname17, F. M., Author Surname18, F. M.,  Author Surname19, F. M,¼ Last Author name, F. M. (Publication Year). Article title: Subtitle. Journal Title, Volume (issue), page range. DOI or URL

Fox, J., Harper, D., Bird, A., Kindler, F. A., Feng, H.-G., Seng, A. L., Sevel, K., Ed, E., Nell, A., Ten, T., Elin, K. J., Thomas, A., Thendy, S., Fall, W., Fint, E., Gurdy, A. K., Dondy, D., Egert, E., Nanda, A. L., ¼ Long, G.  (2015). Pedagogising knowledge: Bernstein’s theory of the pedagogic device. British Journal of Sociology of Education, 23 (4), 571–582.

For additional information on APA format, select from one of the source types below. For help creating APA citations, check out the BibMe APA citation generator.

Source Types:

• How to cite a Book in APA
• How to cite a Magazine in APA
• How to cite a Newspaper in APA
• How to cite a Website in APA
• How to cite a Journal Article in APA
• How to cite a Film in APA
• How to cite an Interview in APA
• How to cite a Lecture in APA
• How to cite a TV Show / Radio Broadcast in APA
• How to cite an Encyclopedia in APA
• How to cite a Photograph in APA
• APA 7 Updates

APA Format:

• In-Text Citation Basics
• Reference Page

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As per Section 8.17 from the Publication Manual of the American Psychological Association , for any work that has three or more authors, the name of the first author and “et al.” should be used as in-text citation. The Latin phrase “et al” means “and others” and is used to reduce the citation length.

Example In-Text Citation Entry:

No stretch of reason can categorize cultural appropriation as imaginary (Rahim et al., 2020).

Sometimes, the same set of initial authors and the same publication year appear in a paper. In such rare circumstances, as per Section 8.18 of the APA manual, write out as many names as needed to differentiate between these similar references.

Example In-Text Citation Entries:

Miller, John, Reighstag et al. (2018)

Miller, John, Amudsen, et al. (2018)

As per Section 8.21 and Table 8.1 of the APA Publication Manual , a citation for a group author may be abbreviated in in-text citations. It is not compulsory to do so; however, if the group author is well known or if it appears at least thrice in the paper, then the name of the group may be abbreviated.

Parenthetical in-text citation template and example:

(Full Name of the Group [Abbreviation], year)

(National Institute of Mental Health [NIMH], 2018)

Whether it is a narrative or parenthetical in-text citation, the full name of the group should be mentioned in the first instance, along with the abbreviation.

Narrative in-text citation examples:

The American Psychological Association (APA, 2017) argues that… (first instance)

As per the APA (2017), it is standard practice that… (subsequent instances)

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A citation , in college reading, writing, or speaking, is a reference to a source of information. The goal of all citations is to allow the audience (whether reading or listening) to identify and find the source of your information.  There are several different ways that information can be cited:

• In-text citation s are short notes that must be included with your text where the idea, data, or evidence from that source is used. In-text citations should match to a complete list of full citations, usually included as the last page of your paper.
• Verbal citations should be provided when you are giving a speech. You will need to mention the author and something about why the author is worthy of citing.
• Full citations provide all of the elements necessary for the reader to find the exact same source used by the writer. Full citations should be provided  for all the sources used or consulted in your research project. This will usually be in a list at the end of your paper called either a Works Cited list or References page.  It may also be on a separate sheet for speeches.

There are a variety of different formats that can be used for citations - MLA and APA are the two most commonly used at CR, but many other specialized styles exist as well.  Consult your assignment handout or ask your instructor which citation format you will be required to use. 

All citation styles will require you to include important elements from your source so that the reader can find that exact same source. Some of these important elements are author, title, publisher, place of publication, date of publication. APA and MLA styles format the citation elements slightly differently. Select the tab at the top of this guide for the style you need to find instructions, examples, and a PDF handout for that citation style that you can print.

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