Style manuals set standards regarding how to format and document sources in papers and other manuscripts. Style manuals vary by discipline and there is no one correct way to format all papers. Before beginning a paper, always check with your instructor to see if there is a preferred style you should use. The most thorough information about a specific style is usually available in a published style manual. Sometimes you can find style information on websites, but you should use caution when using this information as it could be out of date or inaccurate.
Also, see A Manual for Writers of Term Papers, Theses, and Dissertations by Kate Turabian for Chicago style for students. Available at the Reference Desk [LB 2369 .78 1996]