G.GOPALAKRISHNAN, et al. “IN-VITRO Antioxidant Activities of Methnolic Extract of Root of Coleous Vettiveroides (Jacob)”. International Journal of Pharma and Bio Sciences, vol. 2, no. 4, Dec. 2011, pp. 353-7, https://ijpbs.net/index.php/journal/article/view/1031.