Pujiastuti, Dwi. “Studi Kegempaan Vulkanik Gunungapi Marapi Sumatera Barat”. JURNAL ILMU FISIKA 1, no. 2 (September 30, 2009): 28–38. Accessed March 28, 2024. http://jif.fmipa.unand.ac.id/index.php/jif/article/view/40.