Leidonald, R.; Muhtadi, A.; Ashshiddiq, M. A. .; Siahaan, V. S.; Manurung, B. U. . Water Quality Degradation in the Deli River Watershed, North Sumatra: Impacts of Land Use and Pollution Sources. JPSL 2025, 15 (4), 669. https://doi.org/10.29244/jpsl.15.4.669.