Race, Phil, author
Kaifa, 2006
Buku Teks
Mendelson, Martin, author
Pustaka Binawan Pressindo, 1997
Buku Referensi
McKnight-Trontz, Jennifer, author
Torrent Books, 2004
Buku Teks
Pirie, David B., author
Roetledge, 1985
Buku Referensi
Kirkpatrick, Donald L., author
American Society for Training & Development, 2006
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