Stone, Linton
Tests in english structure and usage
Macmillan, 1970
 Buku Teks SO
Coxon, Rosemary
A level english
Letts Educational, 1994
 Buku Teks SO
Gerber, Philip L.
Effective english
Random House, 1959
 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