Panpraneecharoen, S., and S. Chumanee. “Optimization of the Oil Extraction, Study the Chemical and Physical Properties of Arabica Spent Coffee Grounds”. Science & Technology Asia, Vol. 25, no. 4, Dec. 2020, pp. 12-19, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/208258.