Raven Press, 1985
Buku Teks
Frisancho, A. Roberto, author
University of Michigan Press, 1990
Buku Referensi
World Health Organization, 1980
Buku Teks
Kaufman, Roger, author
American Society for Training & Development, 2013
eBooks
McGoldrick, Beth, author
ATD Press, 2016
Buku Teks