1992
Buku Teks
edited by Glen Chandler, Norma Sullivan and Jan Branson
Monash University, 1988
Buku Teks
Whyte, Robert Orr
Westview Press, 1982
Buku Teks
Gopalan, C.
World Health Organization, 1992
Buku Teks
edited by Denis Dwyer
Longman, 1990
Buku Teks