Saputra, A., P. . Satwikanitya, F. . Puspita, M. W. Sya’bani, M. F. . Agustian, and W. . Pambudi. “Synthesis of Epoxy Oil from Waste Cooking Oil (WCO) Using Acetic Acid and Amberlite Resin IR-120 As Catalyst”. Engineering and Applied Science Research, vol. 50, no. 4, July 2023, pp. 335-42, https://ph01.tci-thaijo.org/index.php/easr/article/view/251726.