1. Germplasm Resources Information Network,2007
2. Medicinal and Other Uses of North American Plants: A Historical Survey with Special Reference to the Eastern Indian Tribes;Erichsen-Brown,1989
3. A Field Guide to Medicinal Plants: Eastern and Central N. America;Foster,1990
4. Native American Ethnobotany;Moerman,1998
5. Therapy with Medicinal Plants in Turkey (Past and Present);Baytop,1984