Widyastuti, Margaretha, Aldina Noer Azizah, and Adinda Aprilia Fajriani. “Evaluation of River Water Pollution Level in Yogyakarta City Using CCME Method and Biodegradability Index”. JURNAL GEOGRAFI 17, no. 1 (March 27, 2025): 110–122. Accessed July 1, 2025. https://jurnal.unimed.ac.id/2012/index.php/geo/article/view/64244.