Mohammad Sobari
Pustaka Firdaus, 1997
Buku Teks SO
Kamer, Pearl M.
Frederick A. Praeger, 1983
Buku Teks SO
Phillips, Jack J.
American Society for Training and Development Press;, 2005
eBooks
editor, Matt Stephens, Peri Umar Farouk, Taufik Rinaldi
Justice for the Poor Project, the World Bank, 2006
Buku Teks SO
Harrington, Diana R., 1940-
The Dryden Press, 1985
Buku Teks SO