Stolten, Jane Henry
Little, Brown & Co., 1981
Buku Teks
Cook, J. Sue
Addison Wesley Publishing, 1987
Buku Teks
Golightley, Malcom, author
Learning matters Ltd., 2008
Buku Teks
Callaghan, Patrick; Playle, John; Cooper, Linda, editor
Oxford Univesity Press, 2009
Buku Teks
Claringbull, Norman, author
Learning Matters, 2011
Buku Teks