1. Riley M Halliday J. Congenital malformations in Victoria, 1983-1994. 1996
2. Prevention of neural tube defects: Results of the Medical Research Council Vitamin Study Research Group;MRC Vitamin Study Research Group;Lancet,1991
3. Prevention of first occurrence neural tube defects by periconceptional vitamin supplementation;Czeizel;New England Journal of Medicine,1992
4. Expert Advisory Group Folic Acid and the Prevention of Neural Tube Defects. 1992
5. Australian Bureau of Statistics National Nutrition Survey: Selected Highlights Australia 1995, Catalogue No. 4802.0. 1997