Nasukwad, Nasukwad, and Alwi Ahmad Sulthon. “Decrease of Free Fatty Acid Levels in Cooking Oil Using Sugar Cane”. Journal of Natural Sciences and Mathematics Research, vol. 5, no. 1, June 2019, pp. 24-27, https://journal.walisongo.ac.id/index.php/JNSMR/article/view/11027.