Gulo, T., Lubis, S. N., & Lubis, A. A. R. D. (2024). Income Analysis of Coffee Farmers and Its Impact on Regional Development (Case Study: Pematang Sidamanik District, Simalungun Regency, Indonesia): English. Asian Multidisciplinary Research Journal of Economy and Learning, 1(1), 20-26. https://argaelpublisher.com/index.php/amjel/article/view/4