Solomon, Lewis D.
West Publishing Co, 1993
Buku Referensi
Soderquist, Larry D.
The Michie Company, 1991
Buku Teks
Hynes, J. Dennis, author
Michie , 1996
Buku Teks
West Publishing Co., 1996
Buku Teks
Solomon, Lewis D.
Little, Brown and Company, 1994
Buku Teks