Scharfe, Hartmut (1 October 1999). "The Doctrine of the Three Humors in Traditional Indian Medicine and the Alleged Antiquity of Tamil Siddha Medicine". The Journal of the American Oriental Society. 119 (4): 609–629. doi:10.2307/604837. JSTOR604837.
Scharfe, Hartmut (1 October 1999). "The Doctrine of the Three Humors in Traditional Indian Medicine and the Alleged Antiquity of Tamil Siddha Medicine". The Journal of the American Oriental Society. 119 (4): 609–629. doi:10.2307/604837. JSTOR604837.