Felter HW. The Eclectic Materia Medica, Pharmacology and Therapeutics. Cincinnati (OH): John K. Scudder; 1922. [Internet]. Reprinted and abridged by Southwest School of Botanical Medicine; 2001. [Accessed 2011 February 2]. Available from: http://www.swsbm.com/FelterMM/Felters_Materia_Medica.pdf