1. http://www.drugresearcher.com/news/ng.asp?n=74588-chiltern-international-india-clinical-trial-cost
2. http://www.ayurveda-textbooks.com/charaka-samhita.html
3. http://www.britannica.com/eb/topic-575657/Susruta-samhita
4. http://www.cdsco.nic.in/html/Schedule-Y(AmendedVersion-2005)original.htm
5. http://icmr.nic.in/ethical.pdf