Pambudi, Setyo, and Sujo no. “KONFIGURASI CEKUNGAN PURBA FORMASI NANGGULAN DI DAERAH NANGGULAN, KULONPROGO, DAERAH ISTIMEWA YOGYAKARTA”. ReTII (March 16, 2017). Accessed July 20, 2025. https://sandbox.itny.ac.id/index.php/ReTII/article/view/502.