Williams, Numan A., author
South Western , 1984
Buku Teks
Chance, Don M., author
Thomson, 2008
Buku Teks
Chance, Don M., author
South-Western Cengage Learning, 2013
Buku Teks
Dorfman, Mark S.
Prentice-Hall, 1998
Buku Teks
Williams, Numan A., author
South-Western Publicashing, 1984
Buku Teks