There are several different guides, called style manuals, that outline how to format your citations correctly. These styles include the same basic parts of a citation, but they organize and present them differently. Which style you use depends on the subject discipline, your instructor's preferences, and sometimes even the school you go to. Ask your instructor when you are uncertain about which style to use.

Some Common Writing Style Manuals:

There are numerous citation handouts and resources to help you further. One good resource is the site Research and Documentation Online from Bedford St. Martin's.