1. Aboussalam, S. 2003. Das ‘Taghanic Event’ im höheren Mitteldevon von West-Europa und Marokko. Münstersche Forschungen zur Geologie und Paläontologie 97:1–332.
2. Almela, A., and J. Revilla. 1950. Especies fósiles nuevas del Devoniano de León. Notas y Communicaciones del Instituto Geológico y Minero de España 20:45–60.
3. d’Archiac, E.J.A., and E.P. de Verneuil. 1842. Memoir on the fossils of the older deposits in the Rhenish Provinces—proceeded by a general survey of the fauna of the Palaeozoic rocks, and followed by a tabular list of the organic remains of the Devonian System in Europe. Transactions of the Geological Society, series 2 6(2):303–410.
4. Archinal, A. 1994. Zur Morphologie, Systematik, Stratigraphie und Ökologie der Gattung Scutellum (Trilobita; Devon). Senckenbergiana Lethaea 74(1/2):291–324.
5. Bather, F.A. 1899. A phylogenetic classification of the Pelmatozoa. British Association for the Advancement of Science, Report 1898:916–923.