Marinaccio, Dave, author
Arcade Publishing, 2015
Buku Teks
Ghillyer, Andrew W., author
McGGraw-Hill Higher education, 2008
Buku Teks
Branson, Richard, author
Virgin Books, 2007
Buku Teks
Swartz, Greg, author
American Society for Training & Development, 2008
eBooks
Hudson, William J., author
John Wiley & Sons, 1993
Buku Teks