Hughes, Joan K.
Prentice-Hall, 1977
Buku Teks SO
Litecky, Charles R.
McGraw-Hill, 1987
Buku Teks
Litecky, Charles R.
McGraw-Hill , 1987
Buku Teks
Thomas, Susan J.
American Society for Training and Development Press;, 2005
eBooks
Ellis, T.M.R.
Addison-Wesley Pub., 1982
Buku Teks SO