Kullmann, Jürgen, Robert H. Wagner, y Cornelis F. Winkler Prins. «SIGNIFICANCE FOR INTERNATIONAL CORRELATION OF THE PERAPERTÚ FORMATION IN NORTHERN PALENCIA, CANTABRIAN MOUNTAINS. TECTONIC STRATIGRAPHIC CONTEXT AND DESCRIPTION OF MISSISSIPPIAN AND UPPER BASHKIRIAN GONIATITES». Spanish Journal of Palaeontology 22, no. 2 (febrero 14, 2021): 127–145. Accedido diciembre 4, 2024. https://turia.uv.es/index.php/sjpalaeontology/article/view/20419.