Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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