Sommer, Robert
A practical guide to behavioral research: tools and techniques
Oxford University Press, 2001
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Sage handbook of mixed methods in social & behavioral research
Abbas Tashakkori, Charles Teddlie
SAGE Publications, 2010
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Leavitt, Fred
Research methods for behavioral scientists
C. Brown Publishers , 1991
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Cozby, Paul C.
Methods in behavioral research
McGraw-Hill, Higher Education, 2008
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Gravetter, Frederick J.
Research methods for the behavioral sciences
Wadsworth, 2012
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