"Genus: Tagetes L."Germplasm Resources Information Network. United States Department of Agriculture. 6 January 2011. Archived from the original on 9 March 2012. Retrieved 14 July 2011.
web.archive.org
"Genus: Tagetes L."Germplasm Resources Information Network. United States Department of Agriculture. 6 January 2011. Archived from the original on 9 March 2012. Retrieved 14 July 2011.