This is a quick and basic guide to legal citation. Please see the many sources linked below for exhaustive treatment of the intricacies of legal education. Entire books can, and have, been written on the correct use of citation.
The APA Publication Manual in liberal arts is to The Bluebook in Law School.
The Bluebook, copies available at the Circulation Desk, covers how to cite almost any imaginable document you will encounter in law school: cases, statutes, regulations, law review articles, books, and even Zambian statutes.