Portney, Leslie Gross, author
Prentice-Hall, 2000
Buku Teks
Page, Andrew C., author
Cambridge University Press, 2014
eBooks
Naidoo, Jennie, author
Baillere Tindall , 2000
Buku Teks
Edward A.S. Duncan
Churchill Livingstone Elsevier, 2011
Buku Teks
Johnston, Dorothy F
Mosby , 1976
Buku Teks