Universitas Indonesia, 1994
UI - Skripsi (Membership)
Piskurich, George M., author
[American Society for Training & Development Press, American Society for Training & Development Press], 2002
eBooks
Hannabarger, Charles, author
Wiley Publishing, Inc, 2007
Buku Teks
Niven, Paul, author
Elekmedia Computindo, 2005
Buku Teks
Ronald Max Sumual, author
Universitas Indonesia, 1988
UI - Skripsi (Membership)