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