Hartono, H. G., Prakoso, T. W., Dalio, D. W. and Steven, A. (2017) “Studi Awal Keberadaan Gunung Api Purba Tulakan-Ketro, Pacitan, Jawa Timur”, ReTII, 00. Available at: //journal.itny.ac.id/index.php/ReTII/article/view/267 (Accessed: 5December2024).