Martin, Brian, author
Freedom Press, 1993
Buku Teks
edited by Gerald Zaltman, Philip Kotler, Ira Kaufman
Holt, Rinehart and Winston, 1972
Buku Teks
McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks
edited by George K. Zollschan and Walter Hirsch
Halsted Press, 1976
Buku Teks
edited by Eva Etzioni-Halevy and Amitai Etzioni
Basic Books, 1964
Buku Teks