Suntikunaporn, M., S. Echaroj, and W. Rimpikul. “Evaluation of Agricultural Wastes for Biogas Production”. Science & Technology Asia, vol. 19, no. 1, Mar. 2014, pp. 1-8, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/17054.