Martínez Chacón, M Luisa, y Cor F Winkler Prins. «Isogramma Meek & Worthe, 1870 (Dictyonellida, Brachiopoda) from the Pennsylvanian of the Cantabrian Mountains (N Spain)». Spanish Journal of Palaeontology, vol. 31, n.º 1, abril de 2020, pp. 115-29, doi:10.7203/sjp.31.1.17142.