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
English 900 / prepared by English Language Services, Inc.
Collier McMillan , 1964
Buku Teks SO