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Little, Brown and Company, 1957
Buku Teks
Merry, Malcolm
Butterworth, 1985
Buku Teks
Roth, Kenneth M., author
[American Management Association, ], 2004
eBooks
Thomsett, Michael C., author
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eBooks
Hirsanuddin, author
Universitas Indonesia, 1996
UI - Tesis (Membership)