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Yusuf, M., Hutabarat, S. and Hadi, S. 2021. 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, 2 (Sep. 2021), 121–133. DOI:https://doi.org/10.32530/jace.v4i2.247.