Spicer, John W., author
Churchill Livingstone Elsevier, 2008
Buku Teks
edited by Max Samter; section editor, David W. Talmage [and others]
Brown and company, 1978
Buku Teks
The american public health association, 1985
Buku Teks
edited by Leok Goh Chee, Leng Koh Yong
McGraw-Hill, 1995
Buku Teks
Emond, R.T.D., author
Wolfe medical publication, 1987
Buku Referensi