1. Trends in Use of Vitamin and Mineral Supplements in the United States
2. “US Consumer Use of Vitamin, Mineral and Herbal Supplements: VMHS Phase One.” Belleview, WA: Hartman & New Hope, 1998.
3. Roe BE, Derby BM, Levy AS: “Demographic, Lifestyle and Information Use Characteristics of Dietary Supplement User Segments.” Washington DC: Division of Market Studies, Center for Food Safety and Applied Nutrition, Food and Drug Administration, March 1997.
4. Nonvitamin, Nonmineral Dietary Supplements