1. McGuffin, M.; Kartesz, J. T.; Leung, A. Y.; Tucker, A. Q.Herbs of Commerce,2nd ed.American Herbal Products Association:Silver Spring, MD, 2000; p59.
2. Youngken, H. W.InAmerican Druggist and Pharmaceutical Record;American Druggist Publishing Co.:New York, 1921; Vol.69, September, p31.
3. Sleumer, H. O.Flora Neotropica;New York Botanical Garden:Bronx, NY, 1984; Monograph 38, pp12,127.
4. Gladstar, R.Rosemary Gladstar’s Herbal Recipes for Vibrant Health: 175 Teas, Tonics, Oils, Salves, Tinctures, and Other Natural Remedies for the Entire Family;Storey Publishing:North Adams, MA, 2008; p351.
5. Morphoanatomy and pharmacognostic study of the wood of Croton echioides, the Northeastern Marapuama