Toyne, Brian
Allyn and Bacon, 1989
Buku Teks
Sheth, Jagdish N., author
Ohio South-Western Pub, 1989
Buku Teks
Cateora, Philip R., author
MCGraw-Hill, 2005
Buku Teks
Cateora, Philip R., author
McGraw-Hill, 2002
Buku Teks
Cateora, Philip R., author
Richard D. Irwin, 1993
Buku Teks