Wilson, Mike, author
Gower Publishing, 1985
Buku Teks
Boyd, Harper W., Jr., author
Harcourt Brace Jovanovich, 1972
Buku Teks
Kotler, Philip, author
Prentice-Hall, 2000
Buku Teks
Kotler, Philip, author
Prentice-Hall, 2000
Buku Teks
Kotler, Philip, author
Prentice-Hall, 2003
Buku Teks