Hughes, Mark, author
Chartered Institute of Personnel and Development, 2010
Buku Teks
Palmer, Ian R., author
McGraw-Hill, 2006
Buku Teks
Harvard Business School Press, 2003
Buku Teks
Bridges, William
New York, 1991
Buku Teks
Payne, Vivette, author
[American Management Association;, ], 2005
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