Citing is important in order to acknowledge the work of others and to avoid academic dishonesty or pliagarism. There are various formats for citing sources and your instructor will tell you which to follow.
Explains the purpose of citing as well as explaining the parts of a citation. The rules are for APA (American Psychological Association), but the concepts are universal. APA Video Tutorial, updated 10/28/09. Prepared by D. Metzger