Widiss, Alan I
West Publishing, 1989
Buku Teks
Keeton, Robert E., author
West Publishing, 1988
Buku Teks
Beatty, Jeffrey F., author
South Western Cengage Learning, 2011
Buku Teks
Breyer, Stephen G., 1938-, author
Little, Brown, 1982
Buku Teks
Breyer, Stephen G., 1938-, author
Little, Brown and Company, 1979
Buku Teks