Ullah, K., & Ali, H. (2024). A Framework for Measuring the Sustainability of Energy Systems: A Comparative Analysis of Pakistan, European Union and USA: A Framework for Measuring the Sustainability of Energy Systems: A Comparative Analysis of Pakistan, European Union and USA. International Journal of Economic and Environmental Geology, 15(4), 33–48. https://doi.org/10.46660/ijeeg.v15i4.473