Drake, Charles D.
Sweet & Maxwell, 1972
Buku Teks
Reuschlein, Harold Gill
St. Paul Minn, 1990
Buku Teks
Cremeans, Charles D
Frederck A. Praeger, 1963
Buku Teks
Kolstad, Charles D.
Oxford University Press, 2000
Buku Teks
Westwood, John
Donnington Press , 1971
Buku Teks