Haggard, Thomas R., author
West Publishing, 1996
Buku Teks
Harrison, Jeffrey L., author
West Publishing, 1995
Buku Teks
Bermann, George A., author
Thomson, 2003
Buku Teks
Findley, Roger W., author
West Publishing, 1983
Buku Teks
Squires, Lynn B., author
West Publishing, 1982
Buku Teks