Leavitt, Fred
Research methods for behavioral scientists
C. Brown Publishers , 1991
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Pittenger, David J.
Behavioral research : design and analysis
McGraw-Hill, 2003
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Cozby, Paul C.
Methods in behavioral research
McGraw-Hill, Higher Education, 2008
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Sommer, Robert
Behavioral research: Tools and techniques
New York, 2002
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Kerlinger, Fred Nichols, 1910-
Foundations of behavioral research
Holt, Rinehart and Winston, 1964
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