APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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