Sandys-Winsch, Godfrey
Shaw & Sons, 1993
Buku Teks
Beattie, C. N.
Stevens & Sons Lim. , 1957
Buku Teks
Colston, Catherine
Cavendish Publishing, 1999
Buku Teks
Cooper, Geoffrey
Butterworth, 1971
Buku Teks
edited by John Tingle and Alan Cribb
Blackwell, 2007
Buku Teks