1. Narayana DBA, Katayar CK, Brindavanam NB. Original system: search, research or re-search. IDMA Bulletin 1998;29(17):413–416.
2. Sastry VVS, ed. Tridosha Theory. Kottakkal, India: Arya Vaidya Sala; 1996:3–6.
3. Pillai NK, ed. History of Siddha Medicine. Chennai, India: Department of Indian Medicine and Homeopathy; 1998:33–35.
4. Siddiqui MK, ed. State of Unani Medicine in India. New Delhi: CCRUM; 1996:3–5.
5. Mills S, Kerry B, nted. Principles and Practice of Phytotherapy. Livingstone, NY: Churchill: 2000:22–25.