Guilbert, J.J.
World Health Organization, 1998
Buku Referensi
McGraw-Hill, 2003
Buku Teks
Carliner, Saul
American Society for Training & Development Press, 2002
eBooks
Andersen, Elaine
DocMatrix, 1999
Buku Teks
Andersen, Carl E.
Dow Jones-Irwin, 1986
Buku Teks