Aspen Publication, 1995
Buku Teks
World Health Organization, 1988
Buku Teks
World Health Organization
World Health Organization, 2006
Buku Teks
Hicks, Donald, author
Her Majesty's Stationary Office, 1976
Buku Teks
by Helena Pizurki [and others]
WHO, 1987
Buku Teks