Syamsafitri, Syamsafitri, Indra Gunawan, Rahmi Dwi Handayani Rambe, Mahyuddin Dalimunthe, and Nurhayati Nurhayati. “Conversion of Rubber Land Into Palm Oil and Its Effect on Production in North Sumatra”. Jurnal Penelitian Pendidikan IPA 9, no. 3 (March 31, 2023): 1503–1511. Accessed May 20, 2024. https://jppipa.unram.ac.id/index.php/jppipa/article/view/3349.