Levin, Howard S.
John Wiley & Sons, 1956
Buku Teks
McClure, Carma L.
Prentice-Hall, 1989
Buku Teks
McClure, Carma L.
Prentice-Hall, 1989
Buku Teks
Phillips, Jack J.
American Society for Training and Development Press;, 2005
eBooks
edited by Elaine Treharne ... [etal]
Humanities Press, 1992
Buku Teks