K. Ravindhranath, O. S. “Adsorption of Cr (VI) From Polluted Water Using Activated Carbon Prepared From Lagenaria Siceraria”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Feb. 2020, pp. 2134 -8, http://sersc.org/journals/index.php/IJAST/article/view/3565.