USDA SR 28 (2015)
Composition of Foods Raw, Processed, Prepared.
USDA National Nutrient Database for Standar Reference, Release 28 (2015)
Septiembre 2015
U.S. Department of Agriculture
Agriculture Research Service
Beltsville Human Nutrition Research Center
Nutrient Data Laboratory
U.S. Department of Agriculture website: http://www.ars.usda.gov/ba/bhnrc/ndl