Drake, Charles D.
Sweet & Maxwell, 1972
Buku Teks
Reuschlein, Harold Gill, author
St. Paul Minn, 1990
Buku Teks
Westwood, John
Donnington Press , 1971
Buku Teks
Drake, Charles D.
Sweet and Maxwell , 1972
Buku Teks
Crane, Judson
West Publishing Co., 1952
Buku Teks