1. http://research.ncku.edu.tw/re/articles/20100507/3.html – Banyan.
2. http://cnx.org/contents/m34656/latest/?collection – Connexions.
3. www.himalayahealthcare.com/aboutayurveda/cahm.htm – Himalaya.
4. http://en.wikipedia.org – Wikipedia.
5. Handbook of Photovoltaic Science and Engineering;Luque,2003