Ward, Peter D. «Maastricthtian Ammonite and Inoceramid Ranges from Bay of Biscay Cretaceous-Tertiary Boundary Sections». Spanish Journal of Palaeontology 3, no. 2 (septiembre 2, 2022): 119–126. Accedido noviembre 24, 2024. https://turia.uv.es/index.php/sjpalaeontology/article/view/25166.