Sudiyanto, Anton, Dyah Probowati, and Afsal Ahmad Arief. “ANALISIS KELAYAKAN EKONOMI RENCANA PENAMBANGAN BATU ANDESIT DI DESA HARGOREJO, KABUPATEN KULON PROGO DAERAH ISTIMEWA YOGYAKARTA”. ReTII (March 3, 2016). Accessed April 19, 2025. https://journal.itny.ac.id/index.php/ReTII/article/view/186.