Elzinga, Kenneth G., author
Yale University Press, 1976
Buku Teks
Hovenkamp, Herbert, author
West Publishing, 1993
Buku Teks
American Bar Association, 1975
Buku Teks
Neale, A.D., author
Cambridge University Press, 1980
Buku Teks
edited by Werner Sichel
Ann Arbor, 1970
Buku Teks