Source: Black's Law Dictionary. 8th. St. Paul, MN: West, 2004
In simple terms, citators help to answer the question, "Is this still good law?"
Information regarding US federal and state cases can be found in various court reporters (see a partial list below). Westlaw Campus Research is one of a couple of databases which compile the contents of these publications online, to make searching easier and faster.
Using Westlaw to find federal and state cases:
US Supreme Court
|U.S.||United States Reports|
|S. Ct.||United States Supreme Court Reporter|
|L. Ed.||US Supreme Court Reports, Lawyer's Edition|
US Appellate Courts
||Federal Reporter 2nd Series
|F. 3d.||Federal Reporter 3rd Serie|
US District Courts
|F. Supp. 2d.
||Federal Supplement 2nd Series
|F. Supp. 3d.||Federal Supplement 3rd Series|