Hughes, Joan K.
Prentice-Hall, 1977
Buku Teks SO
Thomas, Susan J.
American Society for Training and Development Press, 2005
eBooks
Davis, Williams
Addison-Wesley, 1983
Buku Teks SO
Litecky, Charles R.
McGraw-Hill, 1987
Buku Teks SO
Ellis, T.M.R.
Addison-Wesley, 1982
Buku Teks SO