West Publishing Company, 1996
Buku Teks
Dolgin, Erica L.
West Publishing Company, 1997
Buku Teks
Little,Brown and Company, [date of publication not identified]
Buku Teks
Gray, Oscar S.
The Bureau of National Affairs, 1973
Buku Teks
Tabb, William Murray
The Michie Company, 1992
Buku Teks