Bloom, Martin
Prentince-Hall, 1982
Buku Teks
Nugent William R., author
Thomson Learning, 2001
Buku Teks
Lesley Cooper and Lynne Briggs
Allen & Unwin, 2000
Buku Teks
Orme, John G., author
Pearson, 2012
Buku Teks
edited by George Mckenzie, Jackie Powell, Robin Usher
The Falmer Press, 1997
Buku Teks