Anne T. Coughlan, Eric Anderson, Louis W. Stern, Adel El-Ansary
Prentice-Hall, 2001
Buku Teks
Rosenbloom, Bert, author
South Western Cengage Learning, 2012
Buku Teks
Pelton, Lou E., author
McGraw-Hill Irwin, 2002
Buku Teks
Stern, Louis W., author
Prentice-Hall, 1982
Buku Teks
edited by Richard M. Clewett
Richard D. Irwin, 1954
Buku Teks