Yusuf, M., Sakti Hutabarat, and Syaiful Hadi. 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):121-33. https://doi.org/10.32530/jace.v4i2.247.