Yusuf, M., Sakti Hutabarat, and Syaiful Hadi. “Analysis of The Implementation of ISPO Certification on Smallholder Oil Palm Plantation in Beringin Jaya Cooperation Koto Ringin Village Mempura Sub-District Siak District”. Journal of Agribusiness and Community Empowerment (JACE) 4, no. 2 (September 26, 2021): 121–133. Accessed August 3, 2025. http://jurnalpolitanipyk.ac.id/index.php/JACE/article/view/247.