Cremona, Marise
Macmillan, 1989
Buku Teks
Smith, John Cyril
Butterworth, 1992
Buku Teks
Curzon, L.B.
Pitman, 1994
Buku Teks
Clarkson, C. M. V.
Fontana , 1995
Buku Teks
Smith, James Cruickshanks, 1867-1946
English Language Book Society, 1988
Buku Teks