Chalil, Diana, and Riantri Barus. “Risk Analysis for Sustainability of Oil Palm Smallholdings”. Jurnal Manajemen & Agribisnis 16, no. 1 (March 24, 2019): 23. Accessed June 28, 2022. https://jma.journal.ipb.ac.id/index.php/jmagr/article/view/25416.