Kofman, Fred, author
Sounds True , 2006
Buku Teks
Reynolds, Russell S., Jr., author
McGraw-Hill, 2012
Buku Teks
Hendro, author
Andi, 2005
Buku Teks
edited by Peter Krass
John Wiley & Sons, 1997
Buku Teks
Chan, Janis Fisher, author
[American Management Association, American Management Association], 2004
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