“PENENTUAN STATUS MUTU AIR SUNGAI LAE SORAYA KOTA SUBULUSSALAM DENGAN METODE INDEKS PENCEMARAN”. Lingkar: Journal of Environmental Engineering 4, no. 2 (January 25, 2024): 48–60. Accessed October 18, 2026. https://journal.ar-raniry.ac.id/index.php/lingkar/article/view/4116.