A citation is a short, structured note that tells a reader exactly where you found a piece of information, so they can go and look at it themselves. That is the whole job. Everything else, the italics and the commas and the hanging indents, is just convention layered on top of that one purpose.
Most students learn to cite a book and a journal article, and then freeze the first time a teacher asks them to cite a podcast, a museum painting, a TikTok, or a government dataset. The panic is understandable but unnecessary. Once you see what every citation is actually made of, the strange sources stop being strange. They are just the same four pieces, arranged for a slightly different kind of thing.
This guide is for teachers explaining the logic to a class, and for students who want to stop guessing. We will cover the building blocks first, then walk through the sources people most often get stuck on.
The four questions every citation answers
Strip away the formatting and every citation, in every style, answers the same four questions in roughly the same order.
Who is responsible? This is the author, but author is a loose word. For a film it might be the director. For a dataset it might be the agency that collected it. For a forum post it is the username of the person who typed it. The point is not to find a person named "Author." The point is to name whoever created the thing you are pointing at.
When was it made or published? A date lets a reader find the right version and judge how current the information is. Some sources have an exact date, like a tweet. Some only have a year. Some, like a constantly updated web page, force you to add an "accessed on" date because the thing itself keeps changing.
What is it called? The title of the specific item, and often the title of the larger container it lives in. A chapter has a title, and the book that holds it has a title. An episode has a title, and the series that holds it has a title. This nesting is the single most useful idea in modern citation.
Where can the reader find it? A page number, a URL, a DOI, a museum and city, a database name. This is the "go look for yourself" part, and it is the part students most often leave too vague.
If you can answer those four questions about any source, you can cite it. The style guide only decides the punctuation and the order.
Containers: the idea that makes hard sources easy
The most helpful concept in current MLA thinking is the container. A container is the larger whole that holds the thing you are citing. A song sits inside an album. An album might sit inside Spotify. So a streamed song has two containers stacked on top of it.
Once you start seeing containers, weird sources organize themselves. A comment lives inside an article, which lives inside a website. A journal article lives inside a journal, which might live inside a database like JSTOR. You cite the small thing in quotation marks, the container in italics, and you keep nesting outward until you have given the reader a clear path to the exact spot.
This is why you should not look for a separate, memorized rule for every source type. There are not fifty rules. There is one rule, applied to different containers.
Sources people get stuck on
Here is the practical part. These are the source types that send students to the citation generator in a mild panic, with the logic for each.
Films and videos
Decide what you are actually citing. If you are writing about the director's choices, the director is the author. If you are writing about an actor's performance, you might foreground the actor. Then name the title, the studio or distributor, and the year. For something on a streaming platform or YouTube, the platform is a container, so include it and the URL. A common mistake is citing a YouTube clip of a film as if it were the film. Cite what you watched, not the idealized original.
Journal articles
The container is the journal, not the website you downloaded the PDF from. Give the author, article title in quotation marks, journal title in italics, then the volume, issue, year, and page range. The single most important addition for academic work is the DOI, that string starting with 10. A DOI is a permanent address that will still work after the publisher reorganizes its site. If there is a DOI, use it instead of a fragile URL.
Book chapters
This is the classic nesting case. The chapter has its own author and title. The book has its own title and, often, an editor who is not the chapter's author. So you name the chapter author, the chapter title in quotation marks, the book title in italics, the editor, the publisher, the year, and the page range of that chapter. Students frequently cite the book's overall editor as if they wrote the chapter. Keep the chapter author and the book editor separate.
Datasets
Research increasingly leans on data, and data deserves a citation just like prose. Name the author or the agency that produced it, the title of the dataset, the version or year, the publisher or repository, and a DOI or URL. Including the version matters more here than almost anywhere else, because datasets get corrected and reissued, and a reader needs to know which numbers you actually used.
Artwork and images
For a physical work, give the artist, the title in italics, the year, the medium if relevant, and the institution and city that hold it, like a museum. For an image you found online, add the website container and the URL. Be careful with the difference between citing a painting and citing a photograph of a painting in a textbook. Those are two different objects, and which one you cite depends on which one you actually looked at.
Forum posts and comments
These feel unserious to cite, but the logic is identical. The author is the username. The title is the text of the post, or for a comment, you note that it is a comment on a specific article or thread. The container is the platform, Reddit or a course forum or a news site. Include the date and a URL. Yes, you cite an anonymous username as the author. The reader needs to find the post, and the username is how.
Online dictionary entries
A definition has an author too, usually the dictionary itself as a corporate author. Name the dictionary, the word you looked up, the URL, and crucially an accessed date, because online dictionaries revise entries quietly and often. If you quote a definition from a living, updated dictionary, the accessed date is not optional politeness. It is the only thing that pins down which version you saw.
What about AI tools
This is the newest source type and the one teachers ask about most. If a student uses a tool like ChatGPT or Claude to generate text, ideas, or an outline, that use should be disclosed and, where the style guide requires it, cited. The current consensus across major styles is to treat the AI as the author or the source, name the tool and its version, give the date of the conversation, and note that the output is not publicly retrievable the way a book is. A citation here is doing double duty. It credits the tool, and it honestly marks where the student's own thinking stopped and the machine's began.
That second function matters at a school using plagiarism and AI-writing detection. A clear citation is not an admission of weakness. It is the opposite. It is the difference between using a tool and hiding that you used one. Detection tools exist to surface undisclosed AI text, and the simplest way to stay on the right side of that line is to disclose and cite in the first place.
Common misconceptions worth correcting
A citation generator removes the need to understand citation. It does not. Generators guess the source type and the fields, and they guess wrong constantly, especially with datasets, AI tools, and anything nested. They are a draft, not a final answer. A student who understands the four questions can catch the generator's mistakes. A student who does not will copy them.
Every source needs a different memorized format. No. Every source needs the same four answers, arranged by container. Teach the logic and the formats follow.
If it has no obvious author, you cannot cite it. You can. Use the organization, the username, or the title as the author. "No human name" never means "no citation."
Citing is about avoiding punishment. It is really about letting a reader retrace your steps and judge your sources for themselves. That framing turns citation from a chore into a habit of honesty, which is the version worth teaching.
Cite the thing you actually used, answer the four questions, and nest outward through the containers. Do that and you can cite anything, even the strange stuff that does not have a tidy example in the handbook.