Bell, John
Clarendon Press, 1992
Buku Teks
Levy, Claudine, author
Clarendon Press, 1991
Buku Teks
Kahn-Freund, Otto, 1900-1979, author
Clarendon Press, 1991
Buku Teks
Stone, Geoffrey R.
Little, Brown and Company, 1991
Buku Teks
Wade, E. C. S. (Emlyn Capel Stewart), author
Longmans Green, 1951
Buku Teks