Erwinsyah. “ENVIRONMENTAL KUZNETS CURVE: THE CASE OF CANADA, SPAIN AND INDONESIAN ON CO2EMISSION”. MBA : Journal of Management and Business Aplication 4, no. 1 (February 11, 2021): 366 - 372. Accessed October 5, 2024. https://jurnal.itsm.ac.id/index.php/mba/article/view/421.