Ingram, Robert W.
Thomson/South-Western, 2004
Multimedia
Knapp, Michael C.
Ohio South-Western, 1998
Buku Teks
Harrington, Diana R., 1940-
The Dryden Press, 1985
Buku Teks SO
edited by Michael Doumpos, Constantin Zopounidis, Panos M. Pardalos
Springer, 2012
eBooks
Hampton, John J., 1942-
Prentice-Hall, 1989
Buku Teks SO