Connolly, Francis
Harcourt, Brace & World, 1969
Buku Teks
Heinemann Educational Books, 1981
Buku Teks
Lucas, Michael
Heinemann Educational Books, 1981
Buku Teks
Fry, Edward
The University Press, 1967
Buku Teks
White, Ron, author
Prentice Hall International English Language Teaching , 1994
Buku Teks