APA-referens (7:e uppl.)

Babbie, E. (1989). The practice of social research (5th.ed.). Wadsworth.

Chicago-referens (17:e uppl.)

Babbie, Earl. The Practice of Social Research. 5th.ed. Belmont: Wadsworth, 1989.

MLA-referens (9:e uppl.)

Babbie, Earl. The Practice of Social Research. 5th.ed. Wadsworth, 1989.