Keeler, Marian
John Wiley & Sons, 2009
Buku Teks
Asha Animata
Fakultas Teknik Universitas Indonesia, 2015
UI - Skripsi Membership
Brown, Lester R.
W.W. Norton, 1981
Buku Teks
Krygiel, Eddy
Wiley Publishing, Inc, 2008
Buku Teks
McArdle, Geri E.
American Society for Training & Development, 2007
eBooks