The Nuts and Bolts of College Writing by 
Publication Manual of the American Psychological Association by The OWL Guide, hosted out of Purdue University, is a one-stop-shop for all things citation, providing examples of multiple types of citations in a multitude of formats.
Another option is the Excelsior Online Writing Lab (OWL), which provides examples of sources in various citation styles, sample papers, and interactive online quizzes.
WAC's own Writing Center can help you with citation questions and formatting, as well as any other aspect of the writing process, and is available for consultations.