Damanik, Sarintan Efratani. “Agricultural Ecology of Irrigation Systems and Sustainable Development in Simalungun Region, Indonesia”. Utopía y Praxis Latinoamericana 25, no. 1 (May 15, 2020): 272-281. Accessed September 26, 2025. http://www.produccioncientifica.luz.edu.ve/index.php/utopia/article/view/31899.