Eddelson, Michael
Oxford University Press, 1999
Buku Referensi
Nick Beeching, Geoff Gill.
Wiley-Blackwell, 2014
Buku Teks
InternaPublishing, 2014
Prosiding
Hunter, George E.
W.B. Saunders, 1960
Buku Teks
World Health Organization, [date of publication not identified]
Buku Teks