Documentation in Writing
Documentation of sources is necessary not just in research papers but in any written work that contains information from or references to texts outside itself. Each discipline has methods of documentation that best serve its purposes, and each also prescribes separate forms for books, articles, and Web sites, as well as special forms for such cases as a work by more than one author, two works by the same author, works in more than one volume, material taken from films and electronic sources, and many other special cases.
Extensive information about citation for all styles is available here.
When you have questions about the appropriate style of documentation for a paper, your instructor is almost always the best source of information. Ask!