Arief Fadhilah, author
Universitas Indonesia, 2014
UI - Tesis (Membership)
Dale, Margaret, author
Gramedia, 2003
Buku Teks
Haneberg, Lisa, author
American Society for Training & Development, 2010
eBooks
Planty, Earl G.
Ronald Press Company, 1948
Buku Teks
Dew, R. Beresford
Wiley, 1973
Buku Teks