BABBIE, E. R. (1973). Survey research methods. Wadsworth Pub. Co.
Chicago-čujuhus (17. p.)BABBIE, Earl R. Survey Research Methods. Belmont: Wadsworth Pub. Co, 1973.
MLA-čujuhus (9. p.)BABBIE, Earl R. Survey Research Methods. Wadsworth Pub. Co, 1973.
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