Babbie, E. R. (1979). The practice of social research (2nd ed.). Wadsworth.
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Dyfyniad Arddull Chicago
Babbie, Earl R. The Practice of Social Research. 2nd ed. Belmont: Wadsworth, 1979.
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Dyfyniad MLA
Babbie, Earl R. The Practice of Social Research. 2nd ed. Wadsworth, 1979.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.