Steel, Jon
Wiley, 1998
Buku Teks
Shacford, R.H., author
Public Affairs Press, 1952
Buku Teks
Kang, Woobang, author
Art Media Resources, 2005
Buku Teks
Larry Israelite, editor
American Society for Training & Development, 2006
eBooks
Wrenn, Chase B., 1974-, author
Polity, 2015
Buku Teks