Levoy, Robert P., author
Rajawali , 1986
Buku Teks
Dewi Kusuma Mayasari, author
1986
UI - Skripsi (Membership)
Gendelman, Joel, author
American Society for Training & Development, 2010
eBooks
Wickham, Philip, author
Prentice-Hall, 2008
Buku Teks
Antonius Cahyo, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis (Membership)