Germplasm Resources Information Network (GRIN). „Family: Asteraceae Bercht. & J. Presl, nom. cons.”. Taxonomy for Plants. United States Department of Agriculture (USDA), Agricultural Research Service (ARS), National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Архивирано из оригинала 23. 09. 2015. г. Приступљено 12. 6. 2008.
Germplasm Resources Information Network (GRIN). „Family: Asteraceae Bercht. & J. Presl, nom. cons.”. Taxonomy for Plants. United States Department of Agriculture (USDA), Agricultural Research Service (ARS), National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. Архивирано из оригинала 23. 09. 2015. г. Приступљено 12. 6. 2008.