P.BANGARAIAH, and P.ASHOK KUMAR. “REMOVAL OF METHYLENE BLUE BY USING GREWIA ORBICULATA ROTTL . ( ZINGROOL TREE) AS BIOSORBENT”. International Journal of Pharma and Bio Sciences, vol. 4, no. 3, Sept. 2013, pp. 325-33, https://ijpbs.net/index.php/journal/article/view/2581.