Wagenaar, T. C., & Babbie, E. (1998). The practice of social rasearch (Eighth ed.). Belmont: Wadsworth.
Trích dẫn kiểu ChicagoWagenaar, Theodore C., và Earl Babbie. The Practice of Social Rasearch. Eighth ed. Belmont: Wadsworth, 1998.
MLA CitationWagenaar, Theodore C., và Earl Babbie. The Practice of Social Rasearch. Eighth ed. Belmont: Wadsworth, 1998.
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