American Dietetic Association (2005). "Position of the American Dietetic Association: Fortification and Nutritional Supplements". Journal of the American Dietetic Association. 105 (8): 1300–1311. doi:10.1016/j.jada.2005.06.009. PMID16182650.
Rajakumar, Kumaravel (March 2000). "Pellagra in the United States: A Historical Perspective". Southern Medical Journal. 93 (3): 272–277. doi:10.1097/00007611-200093030-00005. PMID10728513.
American Dietetic Association (2005). "Position of the American Dietetic Association: Fortification and Nutritional Supplements". Journal of the American Dietetic Association. 105 (8): 1300–1311. doi:10.1016/j.jada.2005.06.009. PMID16182650.
Rajakumar, Kumaravel (March 2000). "Pellagra in the United States: A Historical Perspective". Southern Medical Journal. 93 (3): 272–277. doi:10.1097/00007611-200093030-00005. PMID10728513.