Babbie, E. R. (1979). The practice of social research (2nd. ed.). Wadsworth.
Chicago-čujuhus (17. p.)Babbie, Earl R. The Practice of Social Research. 2nd. ed. Carlifornia: Wadsworth, 1979.
MLA-čujuhus (9. p.)Babbie, Earl R. The Practice of Social Research. 2nd. ed. Wadsworth, 1979.
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