Myers, David G., author
McGraw-Hill, 2009
Buku Teks
Zikmund, William G., author
South-Western, Cengage Learning, 2010
Buku Teks
Nilles, Jack M., author
Prentice-Hall, 1982
Buku Teks
Jenkins, Lyle, author
Cambridge University Press, 2000
eBooks
Graver, Robert T., author
Prentice-Hall, 2002
Buku Teks