Ahnlee Jang
OMNES, 2018
Artikel Jurnal
edited by Diane Richardson
Open University Press, 1996
Buku Teks SO
Macrorie, Ken
Hayden Book Co., 1980
Buku Teks
Stolovitch, Harold D.
[American Society for Training & Development Press, American Society for Training & Development Press], 2002
eBooks
Mercado, Leonardo N.
Divino World University, 1977
Buku Teks SO