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New York [u.a.]: Routledge, 2012
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Weinheim; Berlin: Verlag Julius Beltz, 1967
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Hillsdale, NJ [u.a.]: Erlbaum, 1987
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Hillsdale, N.J.: Erlbaum, 1980
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Mahwah, N.J: L. Erlbaum Associates, 2002
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American Psychological Association (APA), 1972
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Ovid Technologies (Wolters Kluwer Health), 1961
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Ovid Technologies (Wolters Kluwer Health), 1961
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American Psychological Association (APA), 1949
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JSTOR, 1968
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SAGE Publications, 1980
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Ovid Technologies (Wolters Kluwer Health), 2010
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University of Illinois Press, 1961