Wulandari, Marita, Muhammad Ma’arij Harfadli, and Rahmania Rahmania. “Penentuan Kondisi Kualitas Perairan Muara Sungai Somber, Balikpapan, Kalimantan Timur Dengan Metode Indeks Pencemaran (Pollution Index)”. SPECTA Journal of Technology 4, no. 2 (June 9, 2020): 23–34. Accessed December 13, 2024. https://journal.itk.ac.id/index.php/sjt/article/view/186.