LATIF, AHMAD SAHLI, and Siti Aida Ibrahim. “The Effect of Water Ratio Variation in Soap From Cooking Oil”. Research Progress in Mechanical and Manufacturing Engineering 5, no. 1 (October 17, 2024): 428–434. Accessed August 15, 2026. https://periodical.uthm.edu.my/index.php/rpmme/article/view/15791.