Bravi, Sergio, Piergiulio Cappelletti, Concetta Rispoli, e Manuel Lorusso. «Nodules and Chert Layers in the Ichtyolitic Limestones Formation of Civita of Pietraroja (Southern Apennines, Italy). A Genetical Model». BORNH Bulletin of Regional Natural History 3, no. 1 (aprile 17, 2023): 1–17. Consultato aprile 20, 2025. https://serena.sharepress.it/index.php/bornh/article/view/9978.