Cremona, Marise, author
Macmillan, 1989
Buku Teks
Smith, J. C. (John Cyril), author
Butterworth, 1992
Buku Teks
Curzon, L. B., author
Pitman, 1994
Buku Teks
Allen, Michael J., author
Black Stone Press Limited, 1997
Buku Teks
Smith, J. C. (James Cruickshanks), 1867-1946, author
English Language Book Society, 1988
Buku Teks