Anne T. Coughlan, Eric Anderson, Louis W. Stern, Adel El-Ansary
Prentice-Hall, 2001
Buku Teks
Stern, Louis W.
Prentice-Hall, 1982
Buku Teks
edited by Richard M. Clewett
Richard D. Irwin, 1954
Buku Teks
Stern, Louis W.
Prentice-Hall, 1989
Buku Teks
Rosenbloom, Bert
South Western Cengage Learning, 2012
Buku Teks