USDA 1995: United States Department of Agriculture, Agricultural Research Service, National Genetic Resources Program. Germplasm Resources Information Network (GRIN) [en ligne]. Hyssopus officinalis L. Beltsville (MD) : National Germplasm Resources Laboratory. [Consulté le 16 septembre 2008]. Disponible à : http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl