Rizaluddin, A. T., and H. Hardiani. “Online Monitoring of Effluent Quality for Assessing the Effect of Wastewater Treatment Plant to Discharge into the Receiving Water: A Review”. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, vol. 12, no. 1, May 2021, pp. 7-19, doi:10.21771/jrtppi.2021.v12.no1.p7-19.