ALIJOYO, A. and 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), pp. 65–71. doi: 10.38142/ijesss.v3i1.159.