Port, Michael, author
Houghton Mifflin Harcourt, 2015
Buku Teks
Munter, Mary, author
Prentice-Hall, 2002
Buku Teks
Morrisey, George L., author
Addison-Wesley, 1987
Buku Teks
Toogood, Granville N.
Gramedia Pustaka Utama, 1997
Buku Teks
Kirkpatrick, Donald L., author
American Society for Training & Development, 2006
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