Hubbard, Douglas W., author
Wiley, 2014
Buku Teks
Hubbard, Douglas W., author
John Wiley & Sons, 2007
Buku Teks
Conway, Mal, author
[;American Society for Training & Development Press, American Society for Training & Development Press], 2000
eBooks
Kelley, Donald R., author
Harvard University Press, 1990
Buku Teks
Stewart, David.
BBC Worldwide Limited, 2004
Multimedia