Babbie, E. R. (1986). The practice of social research. Wadsworth.
Tohutoru Kātū Chicago (17th ed.)Babbie, Earl R. The Practice of Social Research. Belmont, Calif.: Wadsworth, 1986.
Tohutoro MLA (9th ed.)Babbie, Earl R. The Practice of Social Research. Wadsworth, 1986.
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