Babbie, E. R. (1990). Survey research methods (2nd ed.). California.
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Citação norma Chicago
Babbie, Earl R. Survey Research Methods. 2nd ed. Belmont: California, 1990.
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Citação norma MLA
Babbie, Earl R. Survey Research Methods. 2nd ed. California, 1990.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.