เทพษร พ., and ศรีรักษา ธ. “Comparisions of Efficiency Wood Pellet Mill between D-type and R-type”. Princess of Naradhiwas University Journal, vol. 10, no. 3, Sept. 2018, pp. 177-83, https://li01.tci-thaijo.org/index.php/pnujr/article/view/132931.