Crainer, Stuart, author
Capstone, 1997
Buku Teks
A & C Black Publishers, 2006
Buku Referensi
Bloomsbury , 2002
Buku Referensi
Goldstein, Beth
McGraw-Hill , 2007
Multimedia
Atwood, Christee Gabour, author
American Society for Training & Development, 2009
eBooks