Gopalan, C., author
World Health Organization, 1992
Buku Teks
Gopalan, C., author
World Health Organization, 1994
Buku Teks
Gopalan, C., author
World Health Organization , 1994
Buku Teks
Coedes, George, author
Univesity of California Press, 1969
Buku Teks
London : IP Publishing Ltd
Majalah, Jurnal, Buletin