Shaughnessy, John J.
Research methods in psychology
McGraw-Hill, 2003
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Elmes, David G
Research methods in psychology
Thomson/Wadsworth, 2006
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Shaughnessy, John J.
Research methods in psychology
McGraw-Hill, 2006
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Shaughnessy, John J.
Research methods in psychology
McGrawhill , 1994
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Zechmeister, Jeanne S.
Essentials of research methods in psychology
McGraw-Hill, 2001
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