Gravetter, F. J. (2008). Research methods for the behavioral sciences (3rd ed.). Wadsworth.
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Chicago-čujuhus (17. p.)
Gravetter, Frederick J. Research Methods for the Behavioral Sciences. 3rd ed. Belmont: Wadsworth, 2008.
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MLA-čujuhus (9. p.)
Gravetter, Frederick J. Research Methods for the Behavioral Sciences. 3rd ed. Wadsworth, 2008.
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