Saragih, Ramainim, Andrian Yosia Marpaung, Jhonson A Marbun, and Sry Artawati. “Coffee Farmers’ Adaptation to Climate Change in Pamatang Sidamanik (Case Study: Pamatang Sidamanik District, Simalungun Regency, North Sumatra)”. Jurnal Penelitian Pendidikan IPA 11, no. 11 (November 25, 2025): 456–464. Accessed December 12, 2025. https://jppipa.unram.ac.id/index.php/jppipa/article/view/13344.