LATIF, A.S. and Ibrahim, S.A. (2024) “The Effect of Water Ratio Variation in Soap From Cooking Oil”, Research Progress in Mechanical and Manufacturing Engineering, 5(1), pp. 428–434. Available at: https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/15791 (Accessed: 12 March 2026).