Jamaluddin, Mohd Riduan, et al. “The Optimization of RHS-Polysulfone Membrane towards Operating Condition for Humic Acid Removal”. Emerging Advances in Integrated Technology, vol. 2, no. 1, June 2021, pp. 7-17, https://publisher.uthm.edu.my/ojs/index.php/emait/article/view/8539.