Spouse, Jenny, author
Churchill Livingstone, 2008
Buku Teks
Hunt, Patricia, author
Macmillan Press, 1983
Buku Teks
Swisher, Linda, author
Mosby Elsevier, 2010
Buku Teks
Earnest, Vicki Vine, author
Scott, Foresman, 1989
Buku Teks
Charles Docherty, Jacqueline McCallum, editor
Oxford Univesity Press, 2009
Buku Teks