Cravens, David W., author
McGraw-Hill Irwin, 2002
Buku Teks
Swayne, Linda E., author
Prentice-Hall International, 1989
Buku Teks
Quelch, John A., author
Prentice-Hall, 2001
Buku Teks
David, Fred R., author
Pearson, 2009
Buku Teks
Wheelen, Thomas L., author
Addison-Weley Publishing , 1990
Buku Teks