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American Psychological Association (APA), 1998
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American Psychological Association (APA), 1994
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American Psychological Association (APA), 1994
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American Psychological Association (APA), 1992
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American Psychological Association (APA), 1987
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JSTOR, 1985
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Oxford University Press (OUP), 1978
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American Psychological Association (APA), 1979
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American Psychological Association (APA), 1979
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Wiley, 1979
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Wiley, 1978
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Wiley, 1969
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JSTOR, 1969
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Wiley, 1967
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JSTOR, 1967
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Wiley, 2008
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Wiley, 1988
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JSTOR, 1988
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American Psychological Association (APA), 1972
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Project MUSE, 2002