Walter, Ingo
Institute of Southeast Asian Studies, 1993
Buku Teks
Zeeshan Hamid
FEUI, 2017
Artikel Jurnal
Traccey, William R.
Amacom , 1974
Buku Teks
Millbower, Lenn
American Society for Training and Development Press, 2004
eBooks
edited by David R. Martinez, Robert A. Bond, M. Michael Vai
CRC Press, 2008
Buku Referensi