WAGE PRAKOSO, T.; WAHYU DALIO, D.; STEVEN, A.; G. HARTONO, H. Studi Awal Keberadaan Gunung Api Purba Tulakan-Ketro, Pacitan, Jawa Timur. ReTII, [S. l.], 2016. Disponível em: https://journal.itny.ac.id/index.php/ReTII/article/view/171. Acesso em: 19 apr. 2025.