Atwood, Christee Gabour
ASTD Press, 2007
Buku Teks
Atwood, Christee Gabour, author
American Society for Training & Development, 2007
eBooks
Covey, Stephen R., author
Free Press, 2004
Buku Teks
Benton, William K., author
Addison-Wesley, 1971
Buku Teks
Tri Antono Matheus, author
Fakultas Psikologi Universitas Indonesia, 2012
UI - Tesis Open