Koch, Richard
Prentice-Hall, 2000
Buku Teks
Arif Rosy, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2012
UI - Tesis Open
Consumers' Association and Hodder and Stoughton , 1988
Buku Teks
McDonald, Michael, 1945-
John Wiley, 2002
Buku Teks
Ellen May, author
Gramedia Pustaka Utama, 2011
Buku Teks