Erickson, Carlton W.H.
McMillan , 1959
Buku Teks
Amir Hamzah Suleiman
Gramedia, 1981
Buku Teks
Citra Putri Pratiwi
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Tesis (Open)
Eline, Leanne
[American Society for Training and Development Press, American Society for Training and Development Press], 1997
eBooks
Amir Hamzah Suleiman
Gramedia, 1985
Buku Teks