Fromm, Erich, author
Pustaka Sinar Harapan, 1990
Buku Teks
Tannen, Deborah
Mizan Media Utama, 2002
Buku Teks
Mortensen, Kurt W., author
American Management Association, 2011
eBooks
Downs, Lisa J., author
American Society for Training & Development, 2009
eBooks
Canary, Daniel
Gilford Press, 1997
Buku Teks