Byham, William C.
FT Press, 2002
Buku Teks SO
Cerami, Charles A.
Prentice-Hall, 1957
Buku Teks
Voe, Merrill De
Prentice-Hall, 1957
Buku Teks SO
Younger, Sandra Millers
American Society for Training and Development Press, 1997
eBooks
Schleh, Edward C.
McGraw-Hill, 1984
Buku Teks