Sihombing, Luhut, and Agus Purwoko. “Challenges in the Development of Cooperative-Based Closed-Loop Refined Palm Oil Agribusiness in Indonesia”. Asian Journal of Agriculture and Rural Development 15, no. 1 (February 19, 2025): 50–59. Accessed May 6, 2025. https://www.archive.aessweb.com/index.php/5005/article/view/5306.