Wiskup, Mark, author
American Management Association, 2007
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Bolton, Robert, author
Prentice-Hall, 1979
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Goulston, Mark, author
American Management Association, 2010
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Faber, Joanna, author
Bhuana Ilmu Populer, 2020
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Kaplan, Burton, author
Prentice-Hall, 1996
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