Munaf, Edison, Refilda Suhaili, Yefrida Anwar, and Rahmiana Zein. 2010. “Dynamic Removal of Toxic Metals from Wastewater Using Perlite As Sorbent”. Asian Journal of Chemistry 21 (3):2059-66. https://asianpubs.org/index.php/ajchem/article/view/18699.