Sabinus, Sabinus, Erlinda Yurisinthae, & Shenny Oktoriana. " IMPLEMENTASI SERTIFIKASI INDONESIAN SUSTAINABLE PALM OIL SYSTEM (ISPO) PADA PETANI KELAPA SAWIT SWADAYA DI KABUPATEN SANGGAU." JSEP (Journal of Social and Agricultural Economics) [Online], 14.2 (2021): 166-179. Web. 5 May. 2024