O`Neil, Judy, author
American Management Association, 2007
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Ellis Horwood, 1990
Buku Teks
McArdle, Geri, author
[American Management Association;, ], 2010
eBooks
Marquardt, Michael J., author
American Society for Training and Development Press, 2005
eBooks
ALARA Inc, Interchang and Prosperity Press, 2009
Majalah, Jurnal, Buletin