Stone, Biz
New Riders, 2003
Buku Teks
Madge, John
Longman, 1980
Buku Teks
Greeno, Nathan J.
American Society for Training & Development, 2006
eBooks
Doxsee, Kenneth M.
Thomson, Brooks/Cole, 2004
Buku Teks
Kolarik, William J.
McGraw-Hill, 1995
Buku Teks