How to Cite a Case: Reading and Writing Legal Citations

To cite a case, give the party names in italics, then the volume number, the reporter abbreviation, the first page, any pin cite, and the court and year in parentheses. A typical citation looks like Case Name, 410 U.S. 113, 116 (1973). Each element points a reader to the exact opinion, and often the exact page, that you are relying on.

Citing cases correctly matters for two reasons. First, a proper citation lets anyone find and read the source, which is how legal argument stays honest. Second, a sloppy or fabricated citation destroys credibility instantly, and in the AI era, fabricated citations have gotten lawyers sanctioned. Learning both how to write a citation and how to read one is core legal literacy.

How to read a case citation, element by element

Start by learning to read a citation, because writing one is easier once you can decode the parts. Take the sample citation Case Name, 410 U.S. 113, 116 (1973):

• Case name (Case Name): usually the first party versus the second party, shown in italics.
• Volume (410): the numbered volume of the reporter where the opinion appears.
• Reporter (U.S.): the abbreviation for the reporter series. "U.S." is the official United States Reports for Supreme Court decisions.
• First page (113): the page on which the opinion begins.
• Pin cite (116): the specific page you are pointing to for a quotation or proposition. More on this below.
• Court and year (1973): the year of decision, sometimes preceded by the deciding court's abbreviation when the reporter does not make the court obvious.

Once you can parse those pieces, you can locate any cited opinion. A citation is essentially an address: it tells you which building (reporter), which floor (volume), and which room (page) the case lives in.

Why case names look the way they do

The names in a citation are not random. A case name usually pits the first party against the second, joined by "v." for versus. At the trial level the first name is often the plaintiff and the second the defendant, though on appeal the order can flip depending on who appealed. Some cases carry unusual names, such as a case named after a piece of property in certain civil forfeiture matters, or "In re" for a matter without opposing parties. You do not need to master every convention to cite well, but recognizing that the name identifies the parties, and that italicization signals it is a case name, keeps you from misreading a citation. When you shorten a name in a later reference, you typically keep one recognizable party rather than inventing a new label.

Common reporters you will see

Different courts publish in different reporters. A few you will encounter constantly:

• U.S. and S. Ct. for United States Supreme Court decisions (the official reports and a commercial reporter).
• F., F.2d, F.3d, and F.4th for federal courts of appeals decisions.
• F. Supp. and its successors for federal district court decisions.
• Regional reporters such as N.E., A., S.E., So., P., N.W., and S.W. (with second and third series) for state appellate decisions.

The abbreviation tells you which court decided the case, which in turn tells you how much weight the case carries in your jurisdiction. A decision in the official Supreme Court reports binds far more broadly than a single state intermediate appellate decision. This ties directly to binding vs persuasive precedent.

What is a pin cite, and why it matters

The first page number tells you where the opinion starts. A pin cite (also called a jump cite) tells you the exact page where the specific point appears. In Case Name, 410 U.S. 113, 116, the 113 is where the case begins and 116 is where the quoted language or the relevant holding sits.

Pin cites are not optional politeness. When you quote a court or attribute a proposition to a case, the reader (and the judge, and opposing counsel) needs to verify it quickly. A pin cite that lands them on the wrong page, or the absence of a pin cite in a long opinion, signals carelessness. Always pin cite quotations and specific propositions.

How to cite a case: the full form and short form

The first time you cite a case in a document, use the full citation: party names, volume, reporter, first page, pin cite, and court and year. After that, you can use a short form to refer back to it without repeating everything.

A common short form uses one party's name, the volume and reporter, the word "at," and the pin cite, for example Name, 410 U.S. at 118. When the very next citation is to the same source, "Id." (with a pin cite if the page differs, such as "Id. at 120") does the job. Legal citation follows the conventions in The Bluebook or a state-specific style manual, so check which one your court or school requires, because details like spacing and abbreviations vary.

Parallel citations and public domain formats

Some cases appear in more than one reporter. A parallel citation lists more than one location for the same opinion, which is common for state cases published in both an official state reporter and a regional reporter. Increasingly, courts also use medium-neutral or public-domain citations that identify a case by year, court, and decision number rather than by a printed volume and page, so the case can be cited even when no one has the printed reporter.

Citing unpublished and online opinions

Not every decision is published in a print reporter. Unpublished opinions and recent decisions may carry a database identifier instead. When you cite one, include enough information for a reader to locate it, and check your court's rules, because some courts restrict citing unpublished opinions. When a case is available on a free site, it is still good practice to cite the reporter and confirm the case exists in an authoritative source rather than relying on a screenshot.

Verify before you cite: the AI hallucination problem

Here is the part that has become urgent. Generative AI tools can produce citations that look perfectly formatted but point to cases that do not exist. In one widely reported episode, lawyers filed a brief containing fabricated cases that an AI chatbot had invented, and the court sanctioned them. We cover it in detail in AI hallucination in legal cases.

The defense is simple and non-negotiable: verify every citation at its source before you use it. Pull up the actual opinion, confirm the parties, the reporter, the page, and the holding, and make sure your pin cite lands where you say it does. This is exactly why Cases pairs every result with a checkable citation that links to the source, so verification takes seconds instead of being skipped.

Common citation mistakes to avoid

Even careful writers slip on citation details. Watch for these:

• Missing pin cites. Quoting or attributing a specific proposition without a jump cite forces the reader to hunt through the opinion. Always pin.
• Wrong reporter series. Confusing F.2d with F.3d, or an official reporter with a commercial one, points the reader to the wrong volume.
• Dropping the court. When the reporter does not make the deciding court obvious, omitting the court hides how much weight the case carries.
• Stale short forms. Using "Id." after intervening citations to other sources is incorrect, because "Id." refers to the immediately preceding authority.
• Citing a summary, not the case. A headnote or an AI summary is not the opinion. Cite and quote the court's own words.

Each of these is small on its own, but together they signal whether a reader can trust your work. A clean, verifiable citation builds credibility before the reader even weighs your argument.

Citing statutes and secondary sources briefly

Although this guide focuses on cases, real memos and briefs cite more than cases. Statutes are cited by title or code section and year; regulations by their code and section; and secondary sources such as treatises and law review articles by author, title, and location. The same principle applies across all of them: give the reader enough to find the exact source, and point to the precise page or section you rely on. When a case interprets a statute, cite both, so the reader can see the statutory text and the judicial gloss that turned it into workable case law.

A citation checklist

1. Confirm the case actually exists in an authoritative reporter or database.
2. Italicize the case name and get the party names right.
3. Include volume, reporter abbreviation, and first page.
4. Add a pin cite for any quotation or specific proposition.
5. Include the deciding court (when not obvious) and the year.
6. Use the correct style manual for your court or school.
7. Check that the case is still good law before relying on it.

The honest boundary

Citation form is a skill, but a correctly formatted citation is only as good as the case behind it. AI-assisted tools, including Cases, are for informational research only, not legal advice, and no tool should be treated as a substitute for reading the opinion and verifying the citation yourself. Formatting a citation is easy; confirming the case says what you claim is the real work.

Key takeaways

• A citation is an address: case name, volume, reporter, first page, pin cite, court, and year.
• Learn to read a citation first, then writing one becomes straightforward.
• Always pin cite quotations and specific propositions.
• Follow the style manual your court or school requires, since details vary.
• Never cite a case you have not verified exists and still stands as good law.