Oky Sugarbo, Hill. Gendoet Hartono and Bernadeta Subandini Astuti (2014) “Identifikasi Awal Keberadaan Gunung Api Purba Gemawang, Ngadirojo, Wonogiri, Jawa Tengah”, ReTII. Available at: https://journal.itny.ac.id/index.php/ReTII/article/view/1592 (Accessed: 4April2025).