If you are wanting to learn how to cite many resources for your paper, check the library's Citation Guide. It provides information for various forms of citation including MLA, APA, Chicago/Turabian, etc.
If you want to learn how to cite Legal Documents, check out the Legal Citation Guide provided by McGill University. It will show you how to cite cases, statutes, etc.
Refworks is a great citation tool that allows you to easily import citations - from databases or the library catalog. You can also easily enter in citation information.
Once all the basic information is in Refworks (like Authors, Titles, Journal Names, etc.) - and entered into an appropriately named folder - Refworks will easily format your bibliographic information into a bibliography for APA, MLA. Turabian, and a multitude of other citation styles!
To learn how to use Refworks, check out the library's Refworks Help Guide.