Kongrit, Napaphat, Issara Chanakaewsomboon, Jakkrapong Jitjamnong, Apanee Luengnaruemitchai, Naparat Kasetsomboon, Narinphop Chuaykarn, Chatrawee Direksilp, Nonlapan Khantikulanon, and Chin Kui Cheng. 2022. “Development of Mangosteen Peel Ash As a Heterogeneous Catalyst for Palm Oil-Derived Fatty Acid Methyl Ester Production”. Agriculture and Natural Resources 56 (5). Bangkok, Thailand:957–970. https://li01.tci-thaijo.org/index.php/anres/article/view/256576.