U.S. Food and Drug Administration.  Contracts Operation Branch.  Survey of Manufacturing Practices in the Dietary Supplement Industry:  Final Report [Online], prepared by Sheryl C. Cates, et al., Research Triangle Institute, Center for Economics Research. May 17, 2000.  Research Triangle Park, NC:  Research Triangle Institute.  College Park, MD: FoodRisk.org [Distributor]. Available at: http://www.foodrisk.org/exclusives/SMPDSI/downloads/Dietary_Supplement_Survey.pdf

U.S. Food and Drug Administration.  Contracts Operation Branch.  Survey of Manufacturing Practices in the Dietary Supplement Industry [Data file], prepared by Research Triangle Institute.  May 17, 2000.  Research Triangle Park, NC:  Research Triangle Institute.  College Park, MD: FoodRisk.org [Distributor]. Available at: http://www.foodrisk.org/exclusives/SMPDSI/