1. Konings, E. J. M.Dietary Folates in Human Nutrition; Datawyse Universitaire Pers: Maastricht, The Netherlands, 2001; pp 12−13.
2. U.S. Department of Health and Human Services, Food and Drug Administration.Federal Register, Part 3: 21 CFR parts 101, 136, 137, 137, 172; U.S. GPO: Washington, DC, March 5, 1996; pp 8750−8807.
3. Folate intake and food sources in the US population