Ullah, Kafait, and Hussain Ali. “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, no. 4 (December 26, 2024): 33–48. Accessed June 7, 2025. https://econ-environ-geol.org/index.php/ojs/article/view/473.