Redzwan, G., R. Ali S, Y. Yusof, and M. Mohamed N. “A Preliminary Study on the Application of Locally Produced Charcoal As the Activated Carbon for the Adsorption of Organic and Non-Organic Water Pollutants”. Malaysian Journal of Science, vol. 24, no. 2, Aug. 2005, pp. 1-7, https://mjlis.um.edu.my/index.php/MJS/article/view/8292.