Keeton, Robert E., author
West Pub. Co., 1960
Buku Teks
Henderson, Roger C., author
Michie Law , 1996
Buku Teks
Widiss, Alan I
West Publishing, 1989
Buku Teks
Keeton, Robert E., author
West Publishing, 1988
Buku Teks
Burke, Barlow, Jr.
St. Paul, Minn, 1994
Buku Teks