Wolk, Harry L.
PWS-Kent Publishing Company, 1988
Buku Teks
Keith, Lyman A., author
Prentice-Hall, 1985
Buku Teks
Ingram, Robert W., author
South-Western College 2001, 2001
Buku Teks
Ingram, Robert W., author
South-Western, 2005
Multimedia
Riahi-Belkaoui, Ahmed, 1943-, author
Addison-Wesley, 1980
Buku Teks