Lovelock, Christopher H., author
McGraww-Hill, 1993
Buku Teks
MacNamee, Brian
Routledge, 1995
Buku Teks
Stanton, William J., author
McGraw-Hill, 1984
Buku Teks
Kotler, Philip, author
Pearson, 2014
Buku Teks
Swayne, Linda E., author
Prentice-Hall International, 1989
Buku Teks