Muhammad Iqbal, and Mitra Musika Lubis. “Analysis of the People’s Rubber Marketing System in Mandailing Natal: Review of Distribution Channels, Margins, and Efficiency”. International Journal of Health, Economics, and Social Sciences (IJHESS) 7, no. 3 (July 31, 2025): 1566~1570. Accessed August 18, 2025. https://jurnal.unismuhpalu.ac.id/index.php/IJHESS/article/view/8329.