Kotler, Philip
Prentice-Hall, 1976
Buku Teks SO
Kotler, Philip
Prentice Hall International, 1980
Buku Teks SO
Waterston, Albert
Johns Hopkins Press, 1962
Buku Teks
Morgan, Chris
Berlin: Springer-Verlag, 1984
Buku Teks
Lehmann, Donald R.
McGraw-Hill, 2005
Buku Teks SO