Public Library of Science One - PLoS ONE
- 21 nov 2014
- http://journals.plos.org/plosone/
- Public Library of Science
USDA Nutrient Database - USDA Nutrient Database
- U.S. Department of Agriculture
- 02 oct 2014
- http://ndb.nal.usda.gov/ndb/search/list
FAOSTAT - FAOSTAT
- Food and Agriculture Organization of the United Nations
- 02 oct 2014
- http://faostat3.fao.org/faostat-gateway/go/to/home/E
