Traccey, William R.
Amacom , 1974
Buku Teks
West, Brian G., author
Oxford Road, 1986
Buku Teks
Keen, Jeffrey S.
John Wiley & Sons, 1981
Buku Teks
Millbower, Lenn, author
American Society for Training and Development Press, 2004
eBooks
Novack, Clare, author
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks