Westwood, John
Donnington Press , 1971
Buku Teks
Rainey, Bernadette, author
Oxford University Press, 2012
Buku Teks
Curzon, L. B., author
Pitman, 1993
Buku Teks
Drake, Charles D.
Sweet and Maxwell , 1972
Buku Teks
Sherry, John C., author
Collier Books, 1963
Buku Teks