Every citation, regardless of style, includes the same core ingredients: who created the source, what it’s called, when it was published, and where someone can find it. The order and formatting of those pieces change depending on which citation style you’re using, but once you understand the basic building blocks, creating citations in any format becomes straightforward.
The Four Building Blocks of Any Citation
Think of a citation as an address that helps your reader track down the exact source you used. Almost every citation style asks for the same information, just arranged differently:
- Author: The person, group, or organization that created the work. This could be one writer, multiple writers, or an institution like the World Health Organization.
- Title: The name of the specific article, chapter, book, video, or webpage you’re referencing.
- Date: When the source was published or last updated.
- Source location: Where someone can find it. For a book, this means the publisher. For a journal article, it’s the journal name, volume, and page numbers. For an online source, it’s the URL or DOI (a permanent link assigned to academic publications).
If any of these pieces are missing from your source, most styles have rules for handling that. A webpage with no listed author, for instance, typically gets cited by its title instead.
How In-Text Citations Work
Citations appear in two places in your writing. The first is a short marker inside your text, right where you use someone else’s idea or words. The second is a full entry in a list at the end of your paper. Every in-text marker must match up to a complete entry in that final list.
In-text citations generally take one of two forms: parenthetical notes within the sentence or footnotes at the bottom of the page. The parenthetical approach is used by APA and MLA. You place the author’s name and a locator (a year, page number, or both) in parentheses right after the borrowed material. Footnote-based styles, like Chicago, place a small superscript number in the text and put the full or abbreviated citation in a note at the bottom of the page.
When you directly quote a source, you need to point the reader to the exact spot. In APA, that means including the page number after the year: (Jones, 1998, p. 22). For sources without page numbers, like a webpage, you can reference a paragraph number, section heading, or chapter instead. When you paraphrase, putting someone’s idea into your own words, you still cite the author and date but can usually skip the page number.
Choosing the Right Citation Style
Your instructor, publisher, or field will almost always tell you which style to use. If nobody has specified one, here’s how the major styles break down by discipline:
- APA (American Psychological Association): Used in education, psychology, and the sciences. Emphasizes the publication year because recency matters in scientific research. In-text format: (Author, Year).
- MLA (Modern Language Association): Used in the humanities, including English, literature, and philosophy. Emphasizes the author and page number since textual analysis often references specific passages. In-text format: (Author Page).
- Chicago/Turabian: Used in business, history, and the fine arts. Offers two systems: footnotes with a bibliography, or an author-date system similar to APA. The footnote system is the more common choice in history and arts writing.
Each style dictates not just the order of information but also punctuation, capitalization, and formatting details like italics. In APA, for example, book and journal titles are italicized in your reference list and use sentence case capitalization (only the first word and proper nouns are capitalized). But when you mention that same title inside the body of your paper, you switch to title case, capitalizing all words of four letters or more.
Building a Citation Step by Step
Here’s how to construct a citation for a book using each major style. Say you’re citing a book called “Writing New Media” by Anne Wysocki, published in 2004 by Utah State University Press.
In APA, the reference list entry follows this pattern: Author last name, First initial. (Year). Title in sentence case. Publisher. That gives you: Wysocki, A. (2004). Writing new media. Utah State University Press. Your in-text citation would be (Wysocki, 2004).
In MLA, the entry follows: Author last name, First name. Title in Title Case. Publisher, Year. That gives you: Wysocki, Anne. Writing New Media. Utah State University Press, 2004. Your in-text citation would be (Wysocki 15), where 15 is the page number you referenced.
In Chicago footnote style, the note begins with the author’s first name: Anne Wysocki, Writing New Media (Logan: Utah State University Press, 2004), 15. Notice the first name comes first in the footnote, which is nearly the opposite of MLA and APA’s last-name-first approach.
Citing Websites, Videos, and Other Online Sources
Online sources follow the same logic as print sources but swap in a URL or DOI for the publisher and page numbers. For a webpage, you typically need the author (if available), the page title, the website name, the publication or access date, and the URL. For a YouTube video, the creator’s name or channel takes the author spot, the video title serves as the title, and you include the upload date and URL.
Social media posts are cited similarly: the account holder is the author, the text of the post (or its first few words) is the title, and the platform name, date, and link round it out. If the poster’s real name is known, use it as the author and put the handle in brackets.
When to Cite AI Tools
If you used a generative AI tool like ChatGPT to produce text that you then included in your paper, most styles now expect you to cite it. APA treats the AI tool as the author and asks you to include the prompt you used and the date.
However, you generally do not need to cite AI when you used it the same way you’d use a search engine. If you asked an AI chatbot a question and it pointed you to several articles, cite those articles, not the AI. This is the same principle as using Google: you cite what you found, not the tool that helped you find it. You also don’t need to cite AI features built into everyday software, like grammar suggestions or autocomplete in a word processor.
The exception is when your search method itself is part of your analysis. A literature review that describes your research strategy, for instance, might mention which AI tools and search terms you used, just as you’d list which databases you searched.
Tools That Format Citations for You
Citation generators can save significant time. Tools like Zotero, Mendeley, and EndNote let you import source information and automatically format your citations and reference list in whatever style you choose. Many university library websites also offer free citation generators. Google Scholar provides a “Cite” button under each search result that gives you a pre-formatted citation in MLA, APA, and Chicago.
These tools are helpful but not perfect. They sometimes pull incorrect metadata, especially for sources with multiple editions, translated titles, or unusual author configurations. Always check the output against your style guide’s rules before submitting your work. Small errors in punctuation, capitalization, or italicization are common in auto-generated citations and easy to fix if you know what the correct format looks like.