Barnes, David W., author
West Publishing , 1992
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
Dine, Janet, author
Blackstone Press, 1993
Buku Teks
Weatherill, Stephen
Blackstone Press Ltd., 1998
Buku Teks