1. Folic Acid for the Prevention of Neural Tube Defects
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3. Centers for Disease Control and Prevention. 1992. Recommendations for the use of folic acid to reduce the number of cases of spina bifida and other neural tube defects. MMWR 41(No. RR-14): 001.
4. Centers for Disease Control and Prevention. 2001a, May 17. National Folic Acid Campaign. Retrieved November 12, 2001, from the World Wide Web: http://www.cdc.gov/ncbddd/folicacid/folcamp.htm