Kalakota, Ravi
Addison-Wesley, 2001
Buku Teks
McLean, Gary N.
Paradigm Publishing, 1991
Buku Teks
Langford, Beverly Y.
American Management Association, 2005
eBooks
Swartz, Greg
American Society for Training & Development, 2008
eBooks
Weiss, Steve Mark
American Management Association, 2008
eBooks