Buasri, Achanai, Suthita Lertnimit, Arnon Nisapruksachart, Issara Khunkha, dan Vorrada Loryuenyong. 2023. “Box-Behnken Design for Optimization on Esterification of Free Fatty Acids in Waste Cooking Oil Using Modified Smectite Clay Catalyst” 23 (1), 40-51. https://jurnal.ugm.ac.id/v3/AJChE/article/view/9270.