Rosman, M.N.I., Ibrahim, S.A. and Muhammad Yusuf Rosman (2025) “Optimisation of NaOH Concentration for Sustainable Soap Production Using Waste Cooking Oil”, Journal of Advanced Mechanical Engineering Applications, 6(2), pp. 49–57. Available at: https://publisher.uthm.edu.my/ojs/index.php/jamea/article/view/22435 (Accessed: 8 April 2026).