Pearce, John A.
Richard D. Irwin, 1982
Buku Teks
Formisano, Roger A.
McGraw-Hill, 2004
Buku Teks
Formisano, Roger A.
McGraw-Hill, 2004
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Harvard Business Review
Harvard Business Review Press, 2011
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Warren, Kim
John Wiley & Sons, 2002
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