Woodhall, Victoria
Hodder & Stoughton, 1992
Buku Teks
Bennie, michael
How to books, 1994
Buku Teks
by Geraldine Henze
Richard D. Irwin, 1984
Buku Teks
edited by Marianne Chalmers and Martine Pierquin
Oxford University Press, 2002
Buku Referensi
Kruse, Benedict, author
McGraw-Hill, 1976
Buku Teks