Hastama Nugraha, Dimas, and Crista Fialdila Suryanto. “Wastewater Treatment Plant and Wetland Design Analysis (Case Study in Samosir, North Sumatera)”. KnE Social Sciences 3, no. 21 (August 5, 2019): 193–205. Accessed April 24, 2024. https://knepublishing.com/index.php/KnE-Social/article/view/4968.