Redzwan, Ghufran, Rofeah Ali S, Yushamida Yusof, and Marini Mohamed N. 2005. “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 24 (2):1-7. https://mjs.um.edu.my/index.php/MJS/article/view/8292.