McClelland, David Clarence
Human motivation
Cambridge University Press, 1987
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Reeve, Johnmarshall
Understanding motivation and emotion
John Wiley & Sons, Inc., 2015
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Buck, Ross
Human motivation and emotion
John Wiley & Sons, 1988
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McKee, Jeffrey K.
Understanding human evolution
Pearson/Prentice Hall, 2005
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Hyde, Janet Shibley
Understanding human sexuality
McGraw-Hill, 1983
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