Malhotra, Naresh K.
Prentice Hall International, 1996
Buku Teks
Silvia Ulfa, author
PAU-EK-UI, 1991
Buku Teks
Aaker, David A., author
John Wiley & Sons, 1995
Buku Teks
Churchill, Gilbert A., author
Thomson, 2005
Buku Teks
[publisher not identified], [date of publication no identified]
Buku Teks