Terrell Ward Bynum, Simon Rogerson, editors
Blackwell Publishing, 2010
Buku Teks
Kelly, Lucie Young
London MacMillan 1975 , 1975
Buku Teks
Diane Fraser, editor
Churchill livingstone , 2000
Buku Teks
Deloughery, Grace L.
Mosby, 1977
Buku Teks
Deane, Donna
Reston, 1985
Buku Teks