Reuschlein, Harold Gill, author
St. Paul Minn, 1990
Buku Teks
J. Dennis Hynes
West Publshing Co, 1997
Buku Teks
Eisenberg, Melvin A., author
The Foundation Press, 1987
Buku Teks
Drake, Charles D.
Sweet & Maxwell, 1972
Buku Teks
Hynes, J. Dennis, author
Michie , 1996
Buku Teks