McCalman, James
Paul Chapman Production, 1992
Buku Teks
Gilley, Jerry W
Perseus Books, 1999
Buku Teks
Gouillart, Francis J.
McGraw-Hill, 1995
Buku Teks
Diah Ayu Paramitha Iswari, author
Fakultas Psikologi Universitas Indonesia, 2014
UI - Skripsi (Membership)
Emerson, Tricia, author
American Society for Training & Development, 2011
eBooks