Miller, Roger LeRoy, author
Thomson West, 2007
Buku Teks
Jennings, Marianne Moody, author
South Western Cengage Learning, 2012
Buku Teks
edited by Theodore P. Kovaleff
M.E. Sharpe, 1994
Buku Teks
Brown, Gordon W., author
Prentice-Hall, 1990
Buku Referensi
Brown, Louis M.
The Foundation Press, 1978
Buku Teks