Ward, Aidan, author
John Wiley & Sons Ltd, 2003
Buku Teks
Harvard Business School Publishing Corporation, 2002
Buku Teks
Taub, Alexander, author
McGraw-Hill Education, 2014
Buku Teks
Kates, Andrea, author
McGraw-Hill, 2012
Buku Teks
Ryckman, Pamela, author
[American Management Association, ], 2013
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