Wilson, Jennie, author
Bailliere Tindall, 2003
Buku Teks
McMillan Public Comp, 1987
Buku Teks
edited by John M. Last
Appleton Century , 1980
Buku Teks
Edelman, Carole Lium, author
Mosby , 2010
Buku Teks
Penalver, Rafael A., author
Arco Publishing, Inc., 1981
Buku Teks