Ulfa, M., Bejo Slamet, Masrizal Saraan, & Harry Kurniawan. (2022). Correlation Between Community Knowledge Level of River Ecosystem Services and Littering Behavior in Belawan Hilir Sub-watershed. Journal of Sylva Indonesiana, 5(02), 169–178. https://doi.org/10.32734/jsi.v5i02.9421