Gibson, John E., author
John Wiley & Sons, 1981
Buku Teks
John Wiley & Sons, 1983
Buku Teks SO
Howard, Keith, author
MCB University Press, 1990
Buku Referensi
Phillips, Patricia Pulliam, author
American Society for Training & Development Press, 2001
eBooks
Keen, Jeffrey S.
John Wiley & Sons, 1981
Buku Teks