Yahya, Zuhdi, and Akas Pinaringan Sujalu. “Study on The Dynamics of Oil Palm Plantations in East Kalimantan Province”. Jurnal Penelitian Pendidikan IPA 11, no. 6 (June 25, 2025): 23–28. Accessed December 13, 2025. https://jppipa.unram.ac.id/index.php/jppipa/article/view/11720.