Musa, Mursyid, et al. “Glycerolysis-Based Reduction of Free Fatty Acids in Crude Palm Oil (CPO) for Cost Effective Biodiesel Pre-Treatment”. Journal of Advanced Mechanical Engineering Applications, vol. 6, no. 2, Dec. 2025, pp. 42-48, https://penerbit.uthm.edu.my/ojs/index.php/jamea/article/view/22264.