Citation Style Guides
Citing your work: several copies of the major citation styles guides are available at the Reference Desk, including the MLA Handbook, as well as Turabian, Chicago, APA, CSE, AMA, etc.
A Brief Introduction to Citation
How do I know if I need to cite something?
Harris, R.A. (2001). The Plagiarism Handbook: Strategies for Preventing, Detecting, and Dealing With Plagiarism.