ALEXANDER, U. OPEC: Achievements, Constraints/Limitations as a Weapon of International Politics. The International Journal of Humanities & Social Studies, [S. l.], v. 3, n. 6, 2015. Disponível em: https://internationaljournalcorner.com/index.php/theijhss/article/view/140119. Acesso em: 3 jul. 2024.