“Penentuan Status Mutu Kualitas Air Sungai Somber Hulu Menggunakan Metode Indeks Pencemaran” (2026) SPECTA Journal of Technology, 10(1), hlm. 54–62. Tersedia pada: https://journal.itk.ac.id/index.php/sjt/article/view/8481934 (Diakses: 2 November 2026).