Planning in The Development of Multipurpose Cooperatives (KSU) on Coffee Farming Businesses in Mandailing Natal Regency, North Sumatra Province. BISTAN [Internet]. 2025 Dec. 1 [cited 2026 Mar. 10];11(2):21-32. Available from: https://journal.utu.ac.id/index.php/jbtani/article/view/57