Migoń, Piotr, and Edyta Pijet-Migoń. 2021. “Not Simply Volcanoes – The Geoheritage of the Cretaceous System in the Land of the Extinct Volcanoes Geopark, West Sudetes (SW Poland)”. Geotourism/Geoturystyka 17 (1-2(60-61): 3-22. https://doi.org/10.7494/geotour.2020.60-61.3.