Spitzer, Harry, author
Harper & Row, 1982
Buku Teks
Shimp, Terence A., author
South Western Cengage Learning, 2013
Buku Teks
Belch, George E., author
McGraw-Hill, 2001
Buku Teks
Brannen, William H.
Prentice-Hall, 1983
Buku Teks
Belch, George E., author
Irwin, 1993
Buku Teks