Esty, Daniel C.
John Wiley & Sons. Inc., 2009
Buku Teks
Johnson, J. Richard
John F. Rider, 1962
Buku Teks
Emmerichs, Jack
Summit PA. Tab Books, 1983
Buku Teks SO
Nadler, David A
Addison-Wesley, 1977
Buku Teks
Darraugh, Barbara
[American Society for Training and Development Press, American Society for Training and Development Press], 1998
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