Qadaryati, N. “Geohazard Risk Management on Geotourism, Case Study: Pindul Cave, Gunung Kidul - Yogyakarta”. Proceedings of the International Conference of Geological Engineering Faculty, vol. 1, no. 1, Aug. 2021, pp. 10-17, https://tiikmpublishing.com/proceedings/index.php/icgef/article/view/752.