Hicks, Donald, author
Her Majesty's Stationary Office, 1976
Buku Teks
Fry, John, 1922-
MTP Press , 1978
Buku Teks
Jain, Sagar C., author
Robert Wood Johnson Foundation, 1981
Buku Teks
World Health Organization
World Health Organization, 1990
Buku Teks
edited by Joseph M. Kasonde, John D. Martin
World Health Organization, 1994
Buku Teks