Mu’arofah, B. ., and A. Jumrotul Hasanah. “THE TOTAL COLIFORM DENSITY IN TREATED LIQUID WASTE AT UTD PMI NGANJUK REGENCY”. GEMA KESEHATAN, vol. 14, no. 1, June 2022, pp. 35-43, doi:10.47539/gk.v14i1.278.