Wonderling, David
Open University Press, 2005
Buku Teks
Antezana, Fernando
World Health Organization, 1996
Buku Teks
edited by Paul I. Ahmed
Plenum Press, 1979
Buku Teks
Phelps, Charles E.
Harper Collins, 1992
Buku Teks
Illsley, Raymond
Nuffield provincial Hospitals Trust, 1980
Buku Teks