Cita APA (7th ed.)

Wagenaar, T. C., & Babbie, E. (1989). Practicing social research (5th ed.). Wadsworth.

Cita Chicago (17th ed.)

Wagenaar, Theodore C., i Earl Babbie. Practicing Social Research. 5th ed. California: Wadsworth, 1989.

Cita MLA (9th ed.)

Wagenaar, Theodore C., i Earl Babbie. Practicing Social Research. 5th ed. Wadsworth, 1989.