Rosenta Purba, I. ., Harahap, A., & Dieudonne, B. . (2022). Analysis Of The Density Of Coliform Bacteria As An Indicator Of Pollutant In The River Aek Katia Labuhan Batu District. International Journal of Science and Environment (IJSE), 2(1), 33–39. https://doi.org/10.51601/ijse.v2i1.8