Larry Israelite, editor
American Society for Training & Development, 2010
eBooks
Mai, Robert P.
Astd & Irwin, 1996
Buku Teks
Hirsch, Eric Donald, Jr.
Houghton Miffiln, 2007
Buku Teks
Adinda Dewi Putri
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Skripsi (Membership)
Kelley, Tom
gramedia Pustaka utama, 2002
Buku Teks