Findley, Roger W., author
West Publishing, 1983
Buku Teks
Rodgers, William H., author
St. Paul Minn, 1977
Buku Teks
Rodgers, William H., author
West Publishing, 1994
Buku Teks
edited by Daniel Bodansky, Jutta Brunneee and Ellen Hey
Oxford University Press, 2007
Buku Teks
Bell, Stuart, author
Blackstone Press , 2000
Buku Teks