August 2, 2026 · 5 min read

If you've ever stared at a blank Works Cited page at 2am wondering which format your professor actually wants, this is for you.

The short version: APA is for sciences, MLA is for humanities, Chicago is for history and book publishing. But the real answer is always "check your syllabus" because professors love to surprise you with their own hybrid rules.

Here's what actually matters for each one.

APA 7th Edition (American Psychological Association)

Used in: Psychology, Education, Nursing, Business, most social sciences.

What it looks like:

Smith, J. A., & Chen, L. (2024). The effects of sleep deprivation on exam performance. Journal of Sleep Research, 45(2), 112-128. https://doi.org/10.1234/jsr.2024.45.2

Why APA works the way it does: APA cares about when the research was done. That's why the date sits right after the author name — in fields where yesterday's study might be outdated by next month, you need to know immediately how fresh the source is.

The one thing students always mess up: Hanging indent. Every line after the first one should be indented 0.5 inches. In Google Docs, it's Format → Align & indent → Indentation options → Special: Hanging. Takes 10 seconds and your professor will notice if you don't do it.

In-text citations: (Smith & Chen, 2024) for paraphrasing, (Smith & Chen, 2024, p. 115) for direct quotes.

When APA is annoying: You need DOIs for everything. Some older papers don't have them. In that case, just use the URL or skip it — most instructors are fine with "Retrieved from" if a DOI doesn't exist.

MLA 9th Edition (Modern Language Association)

Used in: English, Literature, Philosophy, Languages, Art History.

What it looks like:

Smith, John A., and Lisa Chen. "The Effects of Sleep Deprivation on Exam Performance." Journal of Sleep Research, vol. 45, no. 2, 2024, pp. 112-128.

Why MLA works the way it does: MLA cares about who said what and where. The author's full first name (not just initials like APA) matters because in literary analysis, the identity and perspective of the author often matters to the argument. Page numbers are important because you're often citing specific passages.

The one thing students always mess up: The title is in Title Case AND in quotation marks for articles (or italics for books). Also, MLA 9th removed the "http://" from URLs but kept "https://" — yes, it's weird, yes, you have to do it.

In-text citations: Simply (Smith and Chen 115). No comma, no "p." — just name and page. This brevity is nice once you get used to it.

When MLA is annoying: Formatting author names in the Works Cited. First author is Last, First. Second author is First Last. So "Smith, John A., and Lisa Chen" — not "Smith, John A., and Chen, Lisa." I've gotten this wrong about 40 times.

Chicago (Notes & Bibliography / Author-Date)

Used in: History, Art History, Publishing, some Business schools.

There are actually two Chicago styles, which is confusing:

• Notes & Bibliography (most common in humanities): Footnotes or endnotes, plus a bibliography.
• Author-Date (used in some sciences): Looks like APA but with different punctuation.

What Notes & Bibliography looks like:

Footnote (first citation):

1. John A. Smith and Lisa Chen, "The Effects of Sleep Deprivation on Exam Performance," Journal of Sleep Research 45, no. 2 (2024): 115.

Bibliography entry:

Smith, John A., and Lisa Chen. "The Effects of Sleep Deprivation on Exam Performance." Journal of Sleep Research 45, no. 2 (2024): 112–128.

Why Chicago works the way it does: It's designed for books and long-form academic writing where you want to be able to read a footnote without flipping to the back of a 400-page book. Every footnote tells you everything: author, title, journal, volume, year, page. It's verbose but practical.

When Chicago is annoying: The bibliography entry looks similar to a footnote but uses different punctuation — periods instead of commas, parentheses in different places. Formatting both correctly in the same paper is tedious.

Quick Comparison Table

Which One Should You Actually Use?

If your professor didn't specify (rare, but happens): APA for lab reports and research papers where recent evidence matters. MLA for essays analyzing texts. Chicago for history papers or if you want to look fancy with footnotes.

If you're writing for a specific journal, check their submission guidelines. Most journals list their required style on their website. If they don't — email the editor. Nobody will be mad at you for asking.

The Free Alternative to Doing This Manually

Formatting citations by hand is the sort of tedious, error-prone work that computers should do for you. Our citation generator handles APA 7, MLA 9, and Chicago — pick your style, fill in the source details, and copy the formatted citation. Supports books, websites, journal articles, and more. No sign-up.