Carman, Robert A.
John Wiley & Sons, 1980
Buku Teks
Kolb, David A.
Prentice-Hall, 1991
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Abraham B. Shani, James Brownlee Lau, Dawn Chandler, Jean-Farncois Coget
McGraw-HIll, 2009
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Harvey, Donald F.
Prentice Hall International, 1996
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Kolb, David A.
Prentice-Hall, 1991
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