Gravetter, Frederick J.
Research methods for the behavioral sciences
Wadsworth, 2012
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Gravetter, Frederick J.
Research methods for the behavioral sciences
CT Cengage Learning, 2016
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Gravetter, Frederick J.
Research methods for the behavioral sciences
Cengage, 2018
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Research methods in the social sciences
edited, Bridget Somekh, Cathy Lewin
Sage Publications , 2005
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Polgar, Stephen
Introduction to research in the health sciences
Churchill Livingstone, 1988
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