Stanton, William J., author
McGraw-Hill, 1987
Buku Teks
Kotler, Philip, author
Prentice Hall International, 1983
Buku Teks
Hartley, Robert F., author
Harper & Row, 1983
Buku Teks
Still, Richard R., author
Prentice-Hall, 1966
Buku Teks
Kotler, Philip, author
Erlangga , 1996
Buku Teks