Sudjarid, W., and P. Jarupunphol. “Anaerobic Digestion of Municipal Organic Waste by Using Hydrilla Verticillata (Linnaeus f.) Royle As a Co-Substrate”. Interdisciplinary Research Review, vol. 13, no. 1, Mar. 2018, pp. 55–60, https://ph02.tci-thaijo.org/index.php/jtir/article/view/126272.