Iacobucci, Dawn
John Wiley , 2001
Buku Teks
by Roger A. Kerin ... [and others]
McGraw-Hill, 2002
Buku Teks
Etzel, Michael J.
McGraw-Hill, 2004
Buku Teks
Kurtz, David L.
The Dryden Press , 1981
Buku Teks
Phillips, Charles F.
Boston , Houghton Mifflin
Buku Teks