Maksum, Azhar, Iskandar Muda, Arifin Lubis, and Ibnu Austrindanney Sina Azhar. “Trading of Indonesian Crude Palm Oil Supply Chain and Its Impact on Economic Growth: Implementation of Theory of Comparative Advantage and the Competitive Advantage of Nation”. International Journal of Energy Economics and Policy 11, no. 6 (November 3, 2021): 296–302. Accessed April 20, 2024. https://econjournals.com/index.php/ijeep/article/view/11766.