A. Hafiz and S. A. Ibrahim, “Effect of Varied Degumming Concentrations on Soap from Used Cooking Oil”, rpmme, vol. 5, no. 1, pp. 435–443, Oct. 2024, Accessed: Apr. 08, 2026. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/rpmme/article/view/15793