Ellis, Roger B.
Churchill Livingstone, 2004
Buku Teks
Norton, Barbara A.
Appleton-Century-Crofts , 1986
Buku Teks
Balzer-Riley, Julia W.
Elsevier/Mosby, 2012
Buku Teks
Parker, Marilyn E.
F.A. Davis , 2001
Buku Teks
Berry, Dianne
Open University Press, 2007
Buku Teks