Martin Bollard
Churchill Livingstone, 2009
Buku Teks
Ketterer, Richard F.
Sage, 1981
Buku Teks
Callaghan, Patrick; Playle, John; Cooper, Linda, editor
Oxford Univesity Press, 2009
Buku Teks
edited by Linda Louise Childs, Lesley Coles, Barbara Marjoram
Wiley-Blackwell, 2009
Buku Teks
Arnold, Elizabeth C., author
Elsevier science, 2003
Buku Teks