Buell, Victor P.
McGraw-Hill, 1984
Buku Teks
Russell, Jeffrey
American Society for Training & Development, 2006
eBooks
Matthews, Joseph R.
Libraries Unlimited, 2005
Buku Teks
Mcnamee, Patrick
Heinemann , 1988
Buku Teks
Gilley, Jerry W.
American Society for Training & Development, 1992
eBooks