APA vs MLA vs Chicago: Which Citation Style Does Your Class Use?

Three papers, three classes, three different sets of rules. Your business professor wants APA, your English professor wants MLA, and your history professor wants Chicago, and every one of them will take points off if you use the wrong one. Understanding APA vs MLA vs Chicago is not academic trivia; it is the difference between keeping and losing the easiest points on any rubric.

This guide gives you the fast answer first, then the format differences that actually matter, then how to confirm which style your specific class requires.

The Quick Answer: Which Style for Which Subject

That table covers roughly 90% of US undergraduate coursework. Engineering and computer science are the main exception: those departments usually run on IEEE, a numbered style where sources appear as [1] in the text.

Why the Style You Use Actually Matters

Citation formatting looks like busywork, and it is worth understanding why professors weight it.

A citation style is a consistent system for crediting sources so any reader can trace your evidence back to its origin. Each discipline adopted the system that fits how it uses evidence. The social sciences care when research was published, because a 2003 study of social media means something different from a 2024 one, which is why APA puts the date right in the sentence. Literature scholars care where in a text a quote appears, so MLA gives you the page number instead. Historians work with archival material that does not fit neat templates, so Chicago uses footnotes with room for commentary.

Formatting is also usually a scored line on the rubric, often five to ten percent of an assignment grade. That is a full letter grade on a borderline paper, given away for something you can fix in minutes. Getting it wrong can also drift into an academic integrity problem: sloppy or missing citations look like unattributed source use, and Turnitin flags text with missing citations whether or not you meant to omit them.

APA 7th Edition: The Default at Most US Universities

APA is the author-date system published by the American Psychological Association, and it is the most common style at US colleges. If you are taking business, psychology, nursing, education, or social science courses at schools like Colorado State University, Boston University, or the University of North Texas, expect APA.

How it looks in text. Author and year in parentheses: (Nguyen, 2023). Add a page number for direct quotes: (Nguyen, 2023, p. 45). If a source has three or more authors, use et al. from the very first citation: (Nguyen et al., 2023).

How it looks in your reference list. Alphabetized by author surname, double-spaced, with a hanging indent on every entry. Article and book titles use sentence case, meaning only the first word and proper nouns are capitalized, while journal names are italicized in title case. DOIs appear as full https://doi.org/ links with no “Retrieved from” wording.

Nguyen, T. K., & Patel, R. (2023). Remote work and employee retention in mid-sized firms. Journal of Organizational Behavior, 44(2), 210 to 228. https://doi.org/10.1002/job.2687

Watch out for: the changes from APA 6th. Et al. now applies from three authors instead of six, publisher locations are gone, and student papers no longer need a running head unless your professor asks for one.

MLA 9th Edition: The Humanities Standard

MLA comes from the Modern Language Association and dominates English, literature, languages, and much of the humanities. Students in those programs at Drew University or Marshall University will use it in most classes.

How it looks in text. Author and page number with no comma and no “p.”: (Morrison 47). If you name the author in your sentence, only the page number goes in parentheses.

How it looks in your Works Cited page. MLA 9 is built on one universal template of core elements: Author. “Title of Source.” Title of Container, Other Contributors, Version, Number, Publisher, Date, Location. Elements that do not apply are simply skipped, which is why the same template handles a book, a podcast, and a tweet. Titles use title case, and the reference page is called Works Cited rather than References.

Chen, Laura. “Digital Archives and the Future of Literary Study.” PMLA, vol. 138, no. 1, 2023, pp. 88 to 104.

Watch out for: containers. A chapter sits inside a book, an article inside a journal, an episode inside a series. The container is italicized; the smaller work goes in quotation marks. Getting that backwards is the most common MLA error.

Chicago and Turabian: History, Art, and Publishing

The Chicago Manual of Style is the standard in history, art history, and philosophy, and it is unique because it offers two complete systems. Departments at Southern Illinois University Carbondale or Indiana University Bloomington may use either, so this is the one style where you must check which version your professor wants.

Notes-Bibliography. Numbered footnotes or endnotes in the text, with a full note the first time you cite a source and a shortened note afterward, plus an alphabetized bibliography at the end. This is what history professors usually mean by “Chicago style.”

First note: 1. Mary Beard, SPQR: A History of Ancient Rome (New York: Liveright, 2015), 211.

Shortened note: 2. Beard, SPQR, 215.

Author-Date. Parenthetical citations like (Beard 2015, 211) with a reference list, closer in feel to APA. More common when Chicago appears in the sciences or social sciences.

Turabian is the student edition of Chicago. The rules are essentially identical, packaged for term papers and theses. If your professor says Turabian, follow Chicago and you will be right.

Watch out for: ibid. The 17th edition discourages it in favor of shortened notes, though some professors still accept it.

The Same Source in All Three Styles

One book, three formats, so you can see the differences at a glance:

APA: Cialdini, R. B. (2021). Influence: The psychology of persuasion (Rev. ed.). Harper Business.

MLA: Cialdini, Robert B. Influence: The Psychology of Persuasion. Rev. ed., Harper Business, 2021.

Chicago: Cialdini, Robert B. Influence: The Psychology of Persuasion. Rev. ed. New York: Harper Business, 2021.

Notice the pattern: APA abbreviates first names to initials and puts the year up front, MLA spells names out and puts the year last, and Chicago looks like MLA but adds the publisher’s city. Those three habits account for most of the differences you will encounter.

Paper Format Templates: What Page One Looks Like

The citation style also governs how your paper is laid out. All three use 1-inch margins, double spacing, and a readable 12-point font such as Times New Roman. Page one is where they diverge.

APA 7th student paper, title page

[Title of Your Paper in Bold Title Case]

[Your Full Name]
[Department], [University Name]
[Course Number]: [Course Name]
[Instructor Name]
[Due Date]

Everything is centered in the upper half of the page, double-spaced, each item on its own line. Student papers do not need a running head. Your abstract, if required, goes alone on page 2, and the body starts on page 3.

MLA 9th, first page

[Your Name]                                 [Last Name] 1
[Instructor Name]
[Course Number]
[Day Month Year]

[Title of Your Paper in Title Case]

[Your first paragraph begins here, indented…]

MLA usually has no separate title page. The four-line header block sits flush left at the top of page one, your last name and page number run in the top-right corner of every page, and the title is centered with no bold or underline.

Chicago / Turabian, title page

[Title of Your Paper]
[Subtitle if Any]

[Your Name]
[Course Number and Name]
[Instructor Name]
[Date]

Chicago uses a separate title page with the title about a third of the way down, and the title page carries no page number. Your footnotes appear at the bottom of each page, and the bibliography starts on a new page at the end.

Always check your assignment instructions first, since professors frequently modify these defaults.

Fill-in-the-Blank Citation Templates

Copy the template that matches your source type and style, then replace the bracketed fields. These three source types cover the large majority of undergraduate citations.

Book

APA:      [Last], [F]. [M]. ([Year]). [Title in sentence case]
([Edition]). [Publisher].

MLA:      [Last], [First]. [Title in Title Case]. [Publisher], [Year].

Chicago:  [Last], [First]. [Title in Title Case]. [City]: [Publisher],
[Year].

Journal article

APA:      [Last], [F]. [M]. ([Year]). [Article title in sentence case].
[Journal Name], [Volume]([Issue]), [first] to [last].
https://doi.org/[DOI]

MLA:      [Last], [First]. “[Article Title].” [Journal Name], vol.
[Volume], no. [Issue], [Year], pp. [first] to [last].

Chicago:  [Last], [First]. “[Article Title].” [Journal Name] [Volume],
no. [Issue] ([Year]): [first] to [last].

Website or online article

APA:      [Last], [F]. [M]. ([Year], [Month] [Day]). [Page title in
sentence case]. [Site Name]. [URL]

MLA:      [Last], [First]. “[Page Title].” [Site Name],
[Day Month Year], [URL].

Chicago:  [Last], [First]. “[Page Title].” [Site Name].
[Month Day, Year]. [URL].

In-text citations

APA:      Paraphrase:        ([Author Last], [Year])
Direct quote:      ([Author Last], [Year], p. [Page])
3+ authors:        ([First Author] et al., [Year])

MLA:      Paraphrase/quote:  ([Author Last] [Page])
Author in sentence: … ([Page])

Chicago:  First footnote:    [#]. [First] [Last], [Title] ([City]:
[Publisher], [Year]), [Page].
Shortened note:    [#]. [Last], [Short Title], [Page].

How to Find Out Which Style Your Class Requires

Do not guess, and do not assume the style from your last class carries over. Check in this order:

1. The syllabus. Search it for “APA,” “MLA,” “Chicago,” “citation,” and “format.” Most professors state the required style in the assignment or grading section.
2. The assignment instructions and rubric. These override the syllabus when they differ, and the rubric often tells you how many points formatting is worth.
3. Your department’s norms. Style usually follows the discipline, not the school. An engineering student and a history student at George Mason University will use completely different systems.
4. Ask your professor. One email removes all doubt, and asking early signals you care about getting it right.

If you are still unsure, our free citation style picker identifies the right style from four quick questions about your school, department, and assignment type.

The Mistakes That Cost the Most Points

• Mixing styles in one paper. The most visible error to a grader. Pick one system and apply it everywhere, including your reference page heading.
• Formatting in-text citations by memory. (Smith, 2023) and (Smith 2023) look nearly identical and belong to different styles. That comma is doing real work.
• Skipping the hanging indent. All three styles require it on reference entries, and its absence is the first thing a professor notices.
• Using an outdated edition. APA 7th replaced 6th in 2019 and MLA 9th replaced 8th in 2021. Old templates float around online and produce entries that look wrong.
• Trusting a generator without checking. Automatic tools pull metadata that is sometimes incomplete. Always review author names, dates, and page numbers before you submit.

Let the Tool Handle the Formatting

Once you know your style, there is no reason to format citations by hand. Our free citation generator builds accurate references from a URL, DOI, ISBN, or title in 19 styles, and exports your finished list to Word. We also built dedicated pages with full rules and examples for each major style:

• APA citation generator for APA 7th edition
• MLA citation generator for MLA 9th edition
• Chicago citation generator for both Chicago systems and Turabian
• IEEE citation generator for engineering and computer science

For the underlying rules of any style, Purdue University’s Online Writing Lab (Purdue OWL) remains the most trusted free reference in US higher education, and it is worth bookmarking alongside whichever generator you use.

The Bottom Line

APA, MLA, and Chicago exist because different disciplines value different information: when a source was published, where a quote sits in a text, or what an archival document can tell us. Learn the one your department uses, confirm it per class from the syllabus, and let a generator handle the formatting so your attention goes into the argument instead of the punctuation.

When the writing itself is the hard part, our verified PhD and Master’s qualified tutors help US students structure papers, integrate sources correctly, and get citations right before submission, across business, finance, nursing, humanities, and technology. Message us on WhatsApp with your assignment and deadline, and your first 20-minute session is free.