Hartono, Hill. Gendoet, and Setyo Pambudi. “Gunung Api Purba Mujil, Kulonprogo, Yogyakarta: Suatu Bukti Dan Pemikiran”. ReTII (January 15, 2017). Accessed May 23, 2025. https://journal.itny.ac.id/index.php/ReTII/article/view/261.