John Wiley & Sons, 1983
Buku Teks SO
Howard, Keith
MCB University Press, 1990
Buku Referensi
Phillips, Patricia Pulliam
American Society for Training & Development Press, 2001
eBooks
Traccey, William R.
Amacom , 1974
Buku Teks
Keen, Jeffrey S.
John Wiley & Sons, 1981
Buku Teks