The Participation of Oil Palm Growers ( Elaeis guineensis Jacq.) in Marketing Their Products at the Multi-Business Consumer Cooperative in Pematang Bandar District, Simalungun Regency. Petrop [Internet]. 2025 Mar. 27 [cited 2026 Feb. 4];10(3):36-42. Available from: https://idjpcr.usu.ac.id/jpt/article/view/9101