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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Pittenger, David J.
Behavioral research design and analysis
2003
 Multimedia
Pittenger, David J.
Behavioral research design and analysis
2003
 Multimedia
Cozby, Paul C.
Methods in behavioral research
McGraw-Hill, Higher Education, 2008
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