Porter, Michael E., author
The Free Press , 1990
Buku Teks
Warren, Kim
John Wiley & Sons, 2002
Buku Teks
Dess, Gregory G., author
McGraw-Hill/Irwin, 2005
Buku Teks
Colquitt, Jason A., author
McGraw-Hill Irwin, 2009
Buku Teks
Gilad, Ben, author
[American Management Association, ], 2004
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