Fazio, Tom
Harry N. Abrams, Inc., 2000
Buku Teks
Yalden, Jenice
Cambridge University Press, 1987
Buku Teks
Seedhouse, David
John Wiley & Sons, 2002
Buku Teks
Issel, L. Michele, author
Jones & Bartlett Learning, 2014
Buku Teks
Piskurich, George M., author
American Society for Training and Development, 2006
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