*[http://ecocrop.fao.org/ecocrop/srv/en/cropFindForm FAO Ecocrop]
*[http://www.feedipedia.org/ Feedipedia]
*[http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200009237 Flora of China]
*[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200009237 Flora of North America]
*[http://botanical.com/botanical/mgmh/h/horrad38.html Grieve's herbal]
*[http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl?Armoracia%20rusticana GRIN]