Napitupulu, Haposan Orlando, Ana Arifatus Sa’diyah, and Farah Mutiara. “Integration of Indonesian Coffee Markets and World Coffee Markets”. Journal of Agricultural Socio-Economics (JASE) 1, no. 1 (July 28, 2020): 13–23. Accessed October 15, 2026. https://riset.unisma.ac.id/index.php/JASE/article/view/7153.