Bromhead, Peter
Longman, 1992
Buku Teks SO
Chapman, Richard A.
Constable, 1970
Buku Teks SO
Richards, Denis
Longman, Green, 1952
Buku Teks SO
Gilliat-Ray, Sophie
Cambridge University Press, 2010
Buku Teks SO
McIlroy, John
Manchester University Press , 1995
Buku Teks SO