Brown, Les, 1945-
Tian Xian Wen hua Chuban Gufen You Xian Gongs, 1994
Buku Teks
Smith, Jim
American Society for Training & Development, 2008
eBooks
Udin Yulianto
2003
UI - Skripsi (Membership)
Aris Ahmad Jaya
ABCo , 2006
Buku Teks
Halvorson, Heidi Grant-, 1973-
Plume Penguin Group, 2014
Buku Teks