Sully, Philippa
Mosby Elsevier, 2010
Buku Teks SO
edited by David Partington
Sage, 2002
Buku Teks SO
Norton, Barbara A.
Appleton-Century-Crofts , 1986
Buku Teks SO
Rutherfoord, Andrea J.
Prentice-Hall, 2001
Buku Teks SO
Orey, Maureen
American Society for Training and Development Press;, 2004
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