Munter, Mary
Prentice-Hall, 2002
Buku Teks
Rae, Leslie
McGraw-Hill, 1994
Buku Referensi
Auger, B.Y.
America Manufacturing Company , 1972
Buku Teks
Hammond, John S., 1937-
Harvard Business School, 1999
Buku Teks
Estop, Tora
[American Society for Training and Development Press;, ], 2005
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