APA vs MLA: What Is the Difference?

APA and MLA are the two most common citation styles. APA uses an author-date in-text format and is standard in the social sciences, while MLA uses an author-page format and is standard in the humanities. They also differ in how the reference list is titled and formatted.

What are APA and MLA?

APA is the style of the American Psychological Association, and MLA is the style of the Modern Language Association. Both are complete systems for crediting sources, but they grew out of different fields and reflect different priorities. APA developed for psychology and the social sciences, where the recency of research is important. MLA developed for language and literature, where the exact location of a quote in a text matters. Those origins explain most of the differences you will notice.

In-text citation: author-date vs author-page

The clearest difference is what goes in the in-text citation. APA pairs the author with the year of publication, because in the social sciences knowing how current a study is helps the reader judge it. So an APA in-text citation looks like (Smith, 2024).

MLA pairs the author with the page number, because in the humanities the reader often wants to find the exact spot in a book or article. So an MLA in-text citation looks like (Smith 12), with no comma and no year. This single difference, date versus page, ripples through both styles.

The reference list: References vs Works Cited

Both styles end with a list of full source entries, but they name and format it differently. In APA the list is titled References. In MLA it is titled Works Cited. Beyond the title, the two differ in details such as how author names are written, how titles are capitalized, and how dates are placed within each entry. The underlying elements, author, title, container, date, and location, are the same; the order and styling differ.

Capitalization and small formatting differences

APA generally uses sentence case for the titles of articles and books in the reference list, meaning only the first word and proper nouns are capitalized. MLA generally uses title case, where most major words are capitalized. There are other small differences in punctuation and abbreviation, but the practical takeaway is that you should not mix the two within one document. Pick one and apply it consistently.

Which style should you use?

Most of the time the choice is made for you. Use the style your assignment, instructor, journal, or publisher requires. As a rough guide based on tradition:

• Use APA for psychology, sociology, education, nursing, business, and most social and behavioral sciences.
• Use MLA for English, literature, languages, philosophy, and many humanities subjects.

If no style is specified, pick the one common in your field and stay consistent. The worst outcome is mixing rules from both styles in the same paper.

The bottom line

APA leads with the date and suits fields where recency matters; MLA leads with the page and suits fields where the exact location of text matters. The elements are the same, but the in-text format, the list title, and the capitalization differ. Once you know which style you need, a generator will format both the in-text citation and the full reference correctly so you do not have to track every small rule yourself.

How the same source looks in each style

It helps to picture one source two ways. Take a journal article by a single author. In APA, the in-text citation is the author and year together, like (Smith, 2024), and the reference list, titled References, presents the author with initials, the year, the article title in sentence case, the journal, and a DOI. In MLA, the in-text citation is the author and a page number, like (Smith 12), and the works-cited entry, titled Works Cited, presents the author's full name, the article title in title case and quotation marks, the journal, the date, and a location such as a page range or link. Same article, two different shapes, driven by the field each style serves.

Author names and dates

The two styles also handle names and dates differently. APA shortens first names to initials throughout, which keeps the focus on who and when. MLA spells out the first author's full name, which reflects the humanities habit of treating the author as a person rather than a data point. APA places the year prominently near the front of each reference, while MLA tends to place the full date later in the entry. These are small mechanical differences, but they add up, which is exactly why mixing the two within one paper looks inconsistent to a careful reader.

Headings, formatting, and tone

Beyond citations, APA and MLA carry broader formatting conventions for the whole document, covering things like headings, running heads, and title pages. Those page-level rules sit outside the scope of a single citation, but they reinforce the same point: each style is a complete system meant to be applied as a whole. For your sources specifically, the reliable move is to choose your style, enter your source details once, and let the generator output the matching in-text citation and reference in the correct format.