Muhammad Tariq Majeed and Tania Luni (2020) “Renewable Energy, Circular Economy Indicators and Environmental Quality: A Global Evidence of 131 Countries with Heterogeneous Income Groups”, Pakistan Journal of Commerce and Social Sciences, 14(4), pp. 866–912. Available at: https://jes.ac.pk/index.php/jes/article/view/155 (Accessed: 10 November 2026).