Artikel Jurnal
McInerney, Claire R.
Springer, 2007
Buku Teks
Desouza, Kevin C
Hampshire, 2005
Buku Teks
Tiwana, Amrit
New york, 1999
Buku Teks
Newman, Amy
[American Society for Training & Development Press, American Society for Training & Development Press], 1999
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