APA-referens (7:e uppl.)

Stark, R., & Roberts, L. (2002). Contemporary social research methods (3rd ed.). Wadsworth/Thomson Learning.

Chicago-referens (17:e uppl.)

Stark, Rodney, och Lynne Roberts. Contemporary Social Research Methods. 3rd ed. Australia: Wadsworth/Thomson Learning, 2002.

MLA-referens (9:e uppl.)

Stark, Rodney, och Lynne Roberts. Contemporary Social Research Methods. 3rd ed. Wadsworth/Thomson Learning, 2002.