Shaughnessy, John J.
Research methods in psychology
McGraw-Hill, 1997
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Shaughnessy, John J.
Research methods in psychology
McGraw-Hill, 2003
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Goodwin, C. James
Research in psychology : methods and design
John Wiley & Sons, 2005
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Goodwin, C. James
Research in psychology: methods and design
Wiley , 2010
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Mitchell, Mark L.
Research design explained
Thomson Wadsworth, 2007
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