Ulfa, Mariah, Bejo Slamet, Masrizal Saraan, and Harry Kurniawan. “Correlation Between Community Knowledge Level of River Ecosystem Services and Littering Behavior in Belawan Hilir Sub-Watershed”. Journal of Sylva Indonesiana 5, no. 02 (August 31, 2022): 169–178. Accessed August 27, 2026. https://staging-talenta.usu.ac.id/Jsi/article/view/9421.