Sinaga, Domini Lestari, and Togi Tampubolon. “ANALISIS PERUBAHAN LINGKUNGAN PANAS BUMI TINGGI RAJA KABUPATEN SIMALUNGUN”. EINSTEIN (e-Journal) 7, no. 3 (November 12, 2019): 9–14. Accessed October 13, 2025. https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/15162.