Nicolino, Patricia F.
Kencana Prenada Media , 2007
Buku Teks
Lockett, David M.
NTC Business Books, 1989
Buku Teks
Rossiter, John R., author
Irwin/McGraw-Hiil, 1996
Buku Teks
Quelch, John A., author
Prentice-Hall, 1989
Buku Teks
Davidson, Jeff, author
Prenada, 2010
Buku Teks