Willmore, Joe
American Society for Training and Development Press, 1998
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Said Muhammad Zulfitri
Faculty of Administrative Science Universitas Brawijaya, 2014
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Kahane, Adam
Berrett-Koehler Publishers, 2012
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Shen, Zhenjiang
Springer, 2012
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Bartholomae, David J.
John Wiley & Sons, 1979
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