S.HEMALATHA, and RAJESWARI HARI. “COMPARATIVE ANTIOXIDANT ACTIVITIES OF CRUDE ETHANOLIC AND SAPONIN RICH BUTANOL EXTRACTS OF TRIBULUS TERRESTRIS FRUITS”. International Journal of Pharma and Bio Sciences, vol. 4, no. 4, Dec. 2013, pp. 784-93, https://ijpbs.net/index.php/journal/article/view/2933.