journal journal, “PDF STUDI TENTANG KOPERASI PERKEBUNAN KELAPA SAWIT RAKYAT BERPRESTASI DI INDONESIA Study of the Achievement Cooperative on Smallholder Oil Palm Plantation in Indonesia: Suharno, Yuprin A.D dan Trisna Anggreini”, aev, vol. 11, no. 02, pp. 33–39, Sep. 2019.