Yanti, Mariana, Mhd Asaad, and Mhd Sibuea. “RICE ECONOMIC MODEL IN NORTH SUMATRA”. SOSIAL DAN EKONOMI PERTANIAN 15, no. 2 (September 8, 2021): 51 - 62. Accessed April 20, 2024. https://jurnalfp.uisu.ac.id/index.php/sep/article/view/67.