Shortell, Stephen M. (Stephen Michael), 1944-, author
Delmar, 1994
Buku Teks
Ritchie, J.B., author
West Publshing Company, 1980
Buku Teks
Tiem, Darlene Van, author
American Society for Training & Development, 2006
eBooks
Rogers, David J., author
Charles Schribder's Sons, 1987
Buku Teks
Stedry, Andrew C.
Prentice-Hall, 1960
Buku Teks