Não informado. (1988). Plant Varieties & Seeds. National Institute of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Plant Varieties & Seeds. Cambridge, Inglaterra: National Institute of Agriculture, 1988.
MLA-referens (8:e uppl.)Não informado. Plant Varieties & Seeds. National Institute of Agriculture, 1988.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.