Sinaga, Domini Lestari, and Togi Tampubolon. “ANALISIS PERUBAHAN LINGKUNGAN PANAS BUMI TINGGI RAJA KABUPATEN SIMALUNGUN”. EINSTEIN (e-Journal) 8, no. 1 (February 27, 2020): 61–66. Accessed October 12, 2025. https://jurnal.unimed.ac.id/2012/index.php/einsten/article/view/14098.