<ref name="chemical compositionarboreal medicine">[https://www.ncbi.nlm.nih.gov/pubmed/22557461 VRIKSHAYURVEDA (Arboreal Medicine in Ancient India).]</ref>
<ref name="">[http://www.wjpps.com/download/article/1432979698.pdf THE SCIENCE OF PLANT LIFE (VRIKSHA AYURVEDA) IN ARCHAIC LITERATURE: AN INSIGHT ON BOTANICAL, AGRICULTURAL AND HORTICULTURAL ASPECTS OF ANCIENT INDIA]</ref>