Lighter, Donald E
Jones and Bartlett Publishers, 2013
Buku Teks
Mcevoy, Sean
Routledge, 2006
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Russell, Jeffrey
American Society for Training & Development, 2006
eBooks
Haneberg, Lisa
American Society for Training & Development, 2006
eBooks
Beenham, Rosemary
Clive Bingley, 1990
Buku Teks