Qadariyah, L., S. Sahila, and M. Mahfud. “The Effect of Reaction Time and Temperature on the Synthesis of Methyl Ester Sulfonate Surfactant from Palm Oil As a Feedstock Using Microwave-Assisted Heating”. ASEAN Journal of Chemical Engineering, Vol. 20, no. 2, June 2021, pp. 104-12, https://jurnal.ugm.ac.id/v3/AJChE/article/view/9170.