Sebastian, Juliann G., author
Mosby, 1999
Buku Teks
Spencer, Peter
Churchill livingstone , 1998
Buku Teks
Teena Clouston, author
Wiley, 2010
Buku Teks
edited by Christine Alavi
Routledge, 1995
Buku Teks
Dillon, Patricia M., author
F.A Davis Company, 2003
Buku Teks