APA vs MLA vs Chicago — Which Citation Style Should You Use?

APA, MLA, and Chicago are the three citation styles most US students encounter. Pick based on subject matter: APA for social sciences (psychology, education, business), MLA for humanities (literature, languages, philosophy), and Chicago for history and some social sciences. When in doubt, check your syllabus — and if your syllabus doesn't say, this post will get you to the right pick in 3 minutes.

The free citation generator outputs all three from the same input, so you can preview each style side-by-side before deciding.

Before picking — check these 3 things

Citation style is usually assigned, not chosen. Check in this order:

1. Your syllabus. Most syllabi specify "APA 7," "MLA 9," or "Chicago 17" under the writing guidelines section. This is the authoritative answer.
2. The assignment prompt. Sometimes a specific assignment overrides the default syllabus style. "Use Chicago for this research paper" means use Chicago even if the class is otherwise MLA.
3. Your professor, directly. If the syllabus and prompt are both silent, email the professor. A 30-second question saves a potential grade deduction.

Only when you've exhausted these three should you default to a style based on subject matter. Most "APA vs MLA" confusion actually comes from not checking the syllabus.

When to use each style (by subject)

Use APA 7th edition when the subject is:

• Psychology, sociology, anthropology
• Education, teaching, educational research
• Business, management, economics
• Nursing, public health, medicine (often, though AMA is also common)
• Communication studies, journalism (sometimes)
• Most empirical research across disciplines

Use MLA 9th edition when the subject is:

• English literature, writing, composition
• Modern languages (Spanish, French, German, etc.)
• Philosophy, religious studies
• Art history, film studies
• Cultural studies, rhetoric
• Undergraduate English composition (Comp 101, etc.)

Use Chicago 17th edition when the subject is:

• History (the default)
• Some journalism programs
• Music, musicology
• Classics, ancient studies
• Some social science disciplines that don't use APA
• Book publishing (Chicago Manual of Style is the industry standard)

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Same source in all three styles (side by side)

Here's one journal article cited in APA 7, MLA 9, and Chicago 17 (notes-bibliography). Same author, same article, same journal, same data — three different styles:

APA 7:

Lee, S. J. (2022). Effects of sleep deprivation on academic performance. Journal of Educational Psychology, 45(3), 12–28. https://doi.org/10.1037/edu0000123

MLA 9:

Lee, Sarah J. "Effects of Sleep Deprivation on Academic Performance." Journal of Educational Psychology, vol. 45, no. 3, 2022, pp. 12–28. https://doi.org/10.1037/edu0000123.

Chicago 17 (bibliography):

Lee, Sarah J. "Effects of Sleep Deprivation on Academic Performance." Journal of Educational Psychology 45, no. 3 (2022): 12–28. https://doi.org/10.1037/edu0000123.

Spot the differences:

• APA uses initials for first names; MLA and Chicago use full first names.
• APA puts year right after author; MLA puts year at end; Chicago puts year in parentheses before page range.
• MLA and Chicago use quote marks for article titles; APA uses sentence case with no quotes.
• APA uses "vol." + number; Chicago omits "vol." (just the number); MLA uses "vol. 45, no. 3".
• All three italicize the journal name.

The citation generator produces all three side-by-side — enter the article details once and see the three outputs.

How in-text citations differ

APA 7: (Author, Year) or (Author, Year, p. X) for direct quotes.

Example: "Sleep deprivation significantly reduced test scores (Lee, 2022)." Or with a quote: "Sleep deprivation led to a 15% drop in test scores (Lee, 2022, p. 18)."

MLA 9: (Author page) — no comma, no "p."

Example: "Sleep deprivation significantly reduced test scores (Lee 18)." No year in the in-text citation.

Chicago 17 (notes-bibliography): Footnote number in text, full citation in footnote.

Example: "Sleep deprivation significantly reduced test scores.¹" With footnote: ¹ Sarah J. Lee, "Effects of Sleep Deprivation on Academic Performance," Journal of Educational Psychology 45, no. 3 (2022): 18.

Practical impact: APA requires you to track year for every source. MLA doesn't. Chicago requires you to write footnotes (use Word's Insert Footnote or Google Docs' Insert > Footnote). Chicago takes longer per citation but is cleaner in the body text.

The reference list by any other name

All three styles have a list of sources at the end of the paper, but they're named differently:

• APA 7: "References" — centered, bold, on a new page at the end.
• MLA 9: "Works Cited" — centered, regular weight, on a new page at the end.
• Chicago 17: "Bibliography" (notes-bibliography) or "References" (author-date) — centered, on a new page at the end.

All three alphabetize by author last name (or first word of title if no author). All three use hanging indent. All three double-space throughout (though Chicago allows single-space within entries, double between).

The typography of the headings is a small detail but a visible one — don't mix them up. "References" in an MLA paper looks as wrong as "Works Cited" in an APA paper.

Frequently Asked Questions

What if my professor doesn't specify a style?

Email and ask before you start writing. Different styles require different note-taking habits (APA wants year, MLA wants page numbers in-text, Chicago wants footnotes). Changing styles mid-paper is painful.

Can I use APA for a humanities class or MLA for a psych class?

Only if your professor explicitly allows it. Most don't. A paper in the "wrong" style is often docked points even if the citations are formatted correctly within that style.

What about Harvard, Vancouver, IEEE, Turabian?

Harvard is a family of author-date styles common in UK and Australia. Vancouver is medical/biomedical. IEEE is engineering. Turabian is a simplified Chicago for student papers. If your assignment specifies one of these, look up the specific format — they're not interchangeable with APA/MLA/Chicago.

Is Turabian the same as Chicago?

Nearly identical for citation formatting. Turabian is a simplified version of Chicago aimed at student papers (Kate Turabian was the Chicago Manual's student-paper adapter). For coursework, Chicago output works for Turabian requirements.