Your class research papers will require that you correctly cite your sources. The following links will give you guidance on when and how to cite as well as examples of the various forms of citations in common usage such as MLA, APA and Chicago Style.
This guide from Duke University gives clear examples of citing different sources in the major citation styles, APA, MLA, Chicago, Turabian, and CSE.
Examples of citation styles in a variety of disciplines as well as suggestions of sources of information in databases, books and websites, many of which are available here at Lehigh.
This link will take you to several brief tutorials on Proper Usage including citing, understanding a citation and how to cite.