compiled by Michael and Irene Ash
Gower, 1996
Buku Referensi
edited by H. David Wetts
Jones Medical, 1977
Buku Referensi
A Halsted Press Book, 1979
Buku Referensi
Boyer, Mary Jo, author
J.B. Lippincott , 1994
Buku Teks
Davis, A.
World Health Organization, 1973
Buku Teks