Sauer, Charles
Prentice-Hall, 1983
Buku Teks SO
Kroenke, David M., 1946-
Mitchell Publishing, 1987
Buku Teks SO
edited by A.D. Boardman
John Wiley & Sons, 1980
Buku Teks SO
Academic Press, 2014
eBooks
Patton, William E.
South-Western, 1992
Buku Teks SO