Pergamon Press, 1981
Buku Teks
Gerber, Philip L., author
Random House, 1959
Buku Teks
Achua, Christopher F., author
South Western Cengage Learning, 2013
Buku Teks
Cook, Marshall J. ,author
McGraw-Hill, 2011
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Row, 1996
Buku Teks