1. Fads, frauds, and quackery;Barrett,1999
2. Barrett, S. Herbert, V. The Vitamin Pushers: How the ‘Health Food’ Industry is Selling America a Bill of Goods. Amherst (NY), Prometheus Press, 1994
3. Understanding Nutrition, 7th ed.;Whitney,1996
4. Understanding Nutrition, 4th ed;Whitney,1987
5. Folic acid and vitamin B12;Herbert,1994