example of citing in an essay

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.

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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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APA Formatting and Style Guide (7th Edition)

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In-Text Citations

Resources on using in-text citations in APA style

Reference List

Resources on writing an APA style reference list, including citation formats

Other APA Resources

MLA In-text Citations and Sample Essay 9th Edition

Listing your sources at the end of your essay in the Works Cited is only the first step in complete and effective documentation. Proper citation of sources is a two-part process . You must also cite, in the body of your essay, the source your paraphrased information or where directly quoted material came from. These citations within the essay are called in-text citations . You must cite all quoted, paraphrased, or summarized words, ideas, and facts from sources. Without in-text citations, you are in danger of plagiarism , even if you have listed your sources at the end of the essay. In-text citations point the reader to the sources’ information in the works cited page, so the in-text citation should be the first item listed in the source’s citation on the works cited page, which is usually the author’s last name (or the title if there is no author) and the page number, if provided.

Two Ways to Cite Your Sources In-text

Parenthetical citation.

Cite your source in parentheses at the end of quoted or paraphrased material.

Example with a page number: In regards to paraphrasing, "It is important to remember to use in-text citations for your paraphrased information, as well as your directly quoted material" (Habib 7).

Example without a page number : Paraphrasing is "often the best choice because direct quotes should be reserved for source material that is especially well-written in style and/or clarity" (Ruiz).

Signal Phrase

Within the sentence, through the use of a "signal phrase" which signals to the reader the specific source the idea or quote came from. Include the page number(s) in parentheses at the end of the sentence, if provided.

Example with a page number: According to Habib, "It is important to remember to use in-text citations for your paraphrased information, as well as your directly quoted material" (7).

Example without a page number: According to Ruiz, paraphrasing is "often the best choice because direct quotes should be reserved for source material that is especially well-written in style and/or clarity."

*See our handout "Signal Phrases" for more examples and information on effective ways to use signal phrases for in-text citations.

Do you need to include a page number in your in-text citation?

Printed materials such as books, magazines, journals, or internet and digital sources with PDF files that show an actual printed page number need to have a page number in the citation.

Internet and digital sources with a continuously scrolling page without a page number do not need a page number in the citation.

Commonly used in-text citations in parentheses

Notes on quotes, block quotation format.

When using long quotations that are over four lines of prose or over three lines of poetry in length, you will need to use block quotation format. Block format is indented one inch from the margin (you can hit the "tab" button twice to move it one inch). Additionally, block quotes do not use quotation marks, and the parenthetical citation comes after the period of the last sentence. Please see the following sample essay for an example block quote.

Signal Phrase Examples and Ideas

Please see the following sample essay for different kinds of signal phrases and parenthetical in-text citations, which correspond with the sample Works Cited page at the end. The Writing Center also has a handout on signal phrases with many different verb options.

Learn more about the MLA Works Cited page by reviewing this handout .

For information on STLCC's academic integrity policy, check out this website .

Penn State University Libraries

Apa quick citation guide.

• In-text Citation
• Citing Generative AI
• Citing Web Pages and Social Media
• Citing Articles
• Citing Books
• Citing Business Reports
• Other Formats
• APA Style Quiz

Using In-text Citation

Include an in-text citation when you refer to, summarize, paraphrase, or quote from another source. For every in-text citation in your paper, there must be a corresponding entry in your reference list.

APA in-text citation style uses the author's last name and the year of publication, for example: (Field, 2005). For direct quotations, include the page number as well, for example: (Field, 2005, p. 14). For sources such as websites and e-books that have no page numbers , use a paragraph number, for example: (Field, 2005, para. 1). More information on direct quotation of sources without pagination is given on the APA Style and Grammar Guidelines web page.

Example paragraph with in-text citation

A few researchers in the linguistics field have developed training programs designed to improve native speakers' ability to understand accented speech (Derwing et al., 2002; Thomas, 2004). Their training techniques are based on the research described above indicating that comprehension improves with exposure to non-native speech.   Derwing et al. (2002) conducted their training with students preparing to be social workers, but note that other professionals who work with non-native speakers could benefit from a similar program.

Derwing, T. M., Rossiter, M. J., & Munro, M. J. (2002). Teaching native speakers to listen to foreign-accented speech.  Journal of Multilingual and Multicultural Development , 23 (4), 245-259.

Thomas, H. K. (2004).  Training strategies for improving listeners' comprehension of foreign-accented speech  (Doctoral dissertation). University of Colorado, Boulder.

Citing Web Pages In Text

Cite web pages in text as you would any other source, using the author and date if known. Keep in mind that the author may be an organization rather than a person. For sources with no author, use the title in place of an author.

For sources with no date use n.d. (for no date) in place of the year: (Smith, n.d.). For more information on citations for sources with no date or other missing information see the page on missing reference information on the APA Style and Grammar Guidelines web page. 

Below are examples of using in-text citation with web pages.

Web page with author:

In-text citation

Heavy social media use can be linked to depression and other mental disorders in teens (Asmelash, 2019).

Reference entry

Asmelash, L. (2019, August 14). Social media use may harm teens' mental health by disrupting positive activities, study says . CNN. https://www.cnn.com/2019/08/13/health/social-media-mental-health-trnd/index.html

Web page with organizational author:

More than 300 million people worldwide are affected by depression (World Health Organization, 2018).

World Health Organization. (2018, March 22).  Depression . https://www.who.int/en/news-room/fact-sheets/detail/depression

Web page with no date:

Establishing regular routines, such as exercise, can help survivors of disasters recover from trauma (American Psychological Association [APA], n.d.).

American Psychological Association. (n.d.). Recovering emotionally from disaste r. http://www.apa.org/helpcenter/recovering-disasters.aspx

General Guidelines

In-text references should immediately follow the title, word, or phrase to which they are directly relevant, rather than appearing at the end of long clauses or sentences. In-text references should always precede punctuation marks. Below are examples of using in-text citation.

Author's name in parentheses:

One study found that the most important element in comprehending non-native speech is familiarity with the topic (Gass & Varonis, 1984).

Author's name part of narrative:

Gass and Varonis (1984) found that the most important element in comprehending non-native speech is familiarity with the topic.

Group as author: First citation: (American Psychological Association [APA], 2015) Subsequent citation: (APA, 2015)

Multiple works: (separate each work with semi-colons)

Research shows that listening to a particular accent improves comprehension of accented speech in general (Gass & Varonis, 1984; Krech Thomas, 2004).

Direct quote: (include page number and place quotation marks around the direct quote)

One study found that “the listener's familiarity with the topic of discourse greatly facilitates the interpretation of the entire message” (Gass & Varonis, 1984, p. 85).

Gass and Varonis (1984) found that “the listener’s familiarity with the topic of discourse greatly facilitates the interpretation of the entire message” (p. 85).

Note:  For direct quotations of more than 40 words , display the quote as an indented block of text without quotation marks and include the authors’ names, year, and page number in parentheses at the end of the quote. For example:

This suggests that familiarity with nonnative speech in general, although it is clearly not as important a variable as topic familiarity, may indeed have some effect. That is, prior experience with nonnative speech, such as that gained by listening to the reading, facilitates comprehension. (Gass & Varonis, 1984, p. 77)

Works by Multiple Authors

APA style has specific rules for citing works by multiple authors. Use the following guidelines to determine how to correctly cite works by multiple authors in text. For more information on citing works by multiple authors see the APA Style and Grammar Guidelines page on in-text citation .

Note: When using multiple authors' names as part of your narrative, rather than in parentheses, always spell out the word and. For multiple authors' names within a parenthetic citation, use &.

One author: (Field, 2005)

Two authors: (Gass & Varonis, 1984)

Three or more authors:   (Tremblay et al., 2010)

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