Waterston, Albert
Johns Hopkins Press, 1962
Buku Teks
Beekun, Rafik Issa
International Institute of Islamic Thought, 2006
Buku Teks
Kotler, Philip
Prentice Hall International, 1991
Buku Teks
Kotler, Philip
Prentice-Hall, 1991
Buku Teks
Davis, Randall
Addison-Wesley, 1987
Buku Teks