Korn, Dieter, and Jürgen Bockwinkel. “The Tornoceratid Ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea)”. European Journal of Taxonomy 806, no. 1 (March 21, 2022): 32–51. Accessed May 2, 2024. https://europeanjournaloftaxonomy.eu/index.php/ejt/article/view/1699.