1. 1. Narendranathan M. Thesis submitted to the University of Kerala. 1974.
2. 2. Bourdillion. The Forest Trees of Travancore. 1933; 233.
3. 3. Chen KK and Steldt FA. J Pharmacology and Experimental Therapeutics. 2011; 45: 901-6.
4. 4. Chopra RN, Nair SL and Chopra IC. Glossary of Indian medicinal plants. 1956.
5. 5. Chopra et al. Poisonous plants of India. 1956.