Pongoh, Alfa Winny, Fadillah Putra, and Soemarno. “ The Study of River Water Quality in Water Pollution Control: Case Study of Talawaan River, North Minahasa District, North Sulawesi Province”. Indonesian Journal of Environmental Management and Sustainability 5, no. 2 (June 25, 2021): 72-80. Accessed May 3, 2026. https://ijoems.com/index.php/ijems/article/view/152.