Stone, Linton
Tests in english structure and usage
Macmillan, 1970
 Buku Teks SO
Burton, Samuel Holroyd
English a-level
Macmillan, 1995
 Buku Teks SO
Blundell, Jon
Function in English
Oxford University Press, 1982
 Buku Teks SO
Gerber, Philip L.
Effective english
Random House, 1959
 Buku Teks SO
Coxon, Rosemary
A level english
Letts Educational, 1994
 Buku Teks SO