Pearlson, Keri E., author
John Wiley & Sons, 2009
Buku Teks
edited by Arthur A. Thompson, Jr., A.J. Strickland III, Tracy Robertson Kramer
Irwin/McGraw-Hill, 1998
Buku Teks
Wright, Peter, author
Allyn and Bacon, 1992
Buku Teks
Belbin, R. Meredith
Heinemann, 1983
Buku Teks
Cobb, Anthony T., author
Sage, 2006
Buku Teks