Khuzaimah, Siti, and Norma Eralita. “Utilization of Adsorbent Carbon Coconut Shell for Purification of Used Cooking Oil”. Indonesian Journal of Chemical Analysis (IJCA) 3, no. 2 (September 9, 2020): 88–95. Accessed December 19, 2024. https://journal.uii.ac.id/IJCA/article/view/15992.