Harvard Business School, 2003
Buku Teks
Hastings, Sandra, author
American Society for Training and Development Press, 2005
eBooks
Drost, H.L.
Uitgeverij FED, 1969
Buku Teks
Lisa Haneberg, editor
American Society for Training & Development, 2012
eBooks
Tobin, Daniel R., 1946-
American Society for Training & Development, 2010
eBooks