ALIJOYO, A., & VORST, C. R. (2022). Measuring And Improving The Effectiveness Of ISO 31000 Based Erm In State-Controlled PSO - A Case Study Of Toll Road Operators In Indonesia. International Journal of Environmental, Sustainability, and Social Science, 3(1), 65–71. https://doi.org/10.38142/ijesss.v3i1.159