Zhu hang, G., N. Maelissa, L. Zhang Zhan, A. Widiyanti, W. Umarie, and E. . Setiadi Soedjono. “Monitoring and Maintaining Groundwater Quality: Challenges and Management”. Environmental and Toxicology Management, vol. 2, no. 2, Sept. 2022, pp. 14-20, doi:10.33086/etm.v2i2.3408.