We have information from several sources:
Simon, J.E., A.F. Chadwick and L.E. Craker. 1984. Herbs: An Indexed Bibliography. 19711980.
Herbs Affecting the Central Nervous SystemVarro E. Tyler
Magness, J.R., G.M. Markle, C.C. Compton. 1971. Food and feed crops of the United States.