Wiset, L., and N. Poomsa-ad. “Parchment Coffee Drying Using Microwave Combined With Hot Air: Doi: 10.14456/Mijet.2017.11”. Engineering Access, vol. 3, no. 2, Dec. 2017, pp. 20-24, https://ph02.tci-thaijo.org/index.php/mijet/article/view/10.14456.mijet.2017.11.