Hoffman, K. Douglas
Harcourt College Publishers, 2002
Buku Teks
Zikmund, William G., author
South Western Cengage Learning, 2013
Buku Teks
Fitzpatrick, Peter B., author
AMA Membership Publications Division, American Management Association, 1985
Buku Teks
Berkowitz, Eric N., author
Jones Bartlett Learning, 2017
Buku Teks
Barban, Arnold M
NTC Business Books, 1993
Buku Teks