Mayer, Ann Elizabeth, author
Westview Press, 1995
Buku Teks
edited by Julie Peters and Andrea Wolper
Rouledge, 1995
Buku Teks
World Health Organization, 2003
Buku Teks
P. R. Gandhi, editor
Blackstone Press limited, 2000
Buku Teks
Buergenthal, Thomas
St. Paul Minn, 1988
Buku Teks