P.T.V.LAKSHMI, et al. “A Study On The Genetic Diversity Analysis Of A Medicinally Potential Herb- Enicostemma Littorale Blume (Gentianaceae)”. International Journal of Pharma and Bio Sciences, vol. 2, no. 4, Dec. 2011, pp. 489-96, https://ijpbs.net/index.php/journal/article/view/1116.