Pongoh, A. W., Putra, F., & Soemarno. (2021). 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(2), 72-80. https://doi.org/10.26554/ijems.2021.5.2.72-80