Phelps, Joseph
Jossey-Bass, 1999
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Chapman, Gary, author
Moody Publishers, 2005
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Hryniewicz, Waclaw
Council for Research in Values and Philosophy, 2007
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DeYoung, Kevin, author
Literature Perkantas Jatim, 2015
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Staub, Dick, author
John Wiley & Sons Inc., 2007
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