Leslie Cromwell [and others]
Prentice-Hall, 1976
Buku Teks SO
Jacobs, Philip
Aspen Publication, 1987
Buku Teks SO
Hicks, Lanis L.
Jones & Bartlett Learning, 2014
Buku Teks SO
Allan, David M.
McGraw-Hill, 2008
Buku Teks SO
edited by Hoarst Noack
University Park Press , 1980
Buku Teks SO