Adang Ismail
Pilar Media, 2006
Buku Teks
Baban Sarbana
Elex Media Komputindo, 2002
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Lykins, Lorrie
American Society for Training & Development, 2011
eBooks
Bach, David
Gramedia Pustaka Utama, 2004
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McMillan, Sandy
Elex Media komputindo, 2001
Buku Teks