Citation is the process of explaining to the reader where information in the paper comes from, giving credit to the original writers and researchers whose work has been studied.

Citing Sources
http://www-english.tamu.edu/wcenter/handouts/citing.html

Polishing & Editing Checklist
http://www.gmu.edu/departments/writingcenter/handouts/edit_pol.html

Documenting Sources
http://www.gmu.edu/departments/writingcenter/handouts/docu.html

Paraphrasing
http://www.usca.sc.edu/writingroom/hos/Paraphrasing.html