Ohai, Tim
American Society for Training & Development, 2008
eBooks
Humphries, john
Groiler International, 1993
Buku Teks
Stewart, Grant
Erlangga , 1995
Buku Teks
Seidman, Dan
American Society for Training & Development, 2008
eBooks
Still, Richard R.
Prentice Hall International, 1988
Buku Teks