"Thamnosma Torr. & Frém". Germplasm Resources Information Network. United States Department of Agriculture. 2008-03-21. Retrieved 2010-02-25.
itis.gov
"Thamnosma Torr. & Frém". ITIS Standard Reports. Integrated Taxonomic Information System. Retrieved 2010-02-25.
usda.gov
plants.sc.egov.usda.gov
USDA, NRCS (n.d.). "Thamnosma". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 9 December 2015.