Samovar, Larry A., author
Wadsworth, Thomson Learning, 2000
Buku Teks
GK-Hall, 1994
Buku Teks
Harris, Marvin, 1927-2001, author
Random House, 1977
Buku Teks
Gillespie, Sheena, author
Allyn and Bacon , 1994
Buku Teks
Edmundson, Andrea, author
American Society for Training & Development, 2010
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