References
- Council for Responsible Nutrition. 2006, http://www.crnusa.org/about_recs.html
- Goodrich William W. Interview by Ronald T. Ottes and Fred L. Lofsvold, FDA Oral History Program. U.S. Food and Drug Administration, RockvilleMaryland October 15, 1986, http://www.fda.gov/oc/history/oralhistories/goodrich/default.htm
- Winthrop Chemical Company, Inc. Iconography of Vitamin Deficiencies. Second Series, Winthrop Chemical Company, Inc, New York 1944
- Agricultural Research Service. United States Department of Agriculture, http://www.ars.usda.gov Resources on Vitamin Research
- http://nutrition.gov Dietary Supplements. Nutrition.gov
- MayoClinic.com. http://www.mayoclinic.com
- Office of Dietary Supplements. National Institutes of Health, http://ods.nih.gov
- United States Department of Agriculture, http://www.usda.gov