Churcher, C. S; De Iuliis, G (2001). "A new species of Protopterus and a revision of Ceratodus humei (Dipnoi: Ceratodontiformes) from the Late Cretaceous Mut Formation of eastern Dakhleh Oasis, Western Desert of Egypt". Palaeontology. 44 (2): 305–323. doi:10.1111/1475-4983.00181. ISSN0031-0239.
Churcher, C. S; De Iuliis, G (2001). "A new species of Protopterus and a revision of Ceratodus humei (Dipnoi: Ceratodontiformes) from the Late Cretaceous Mut Formation of eastern Dakhleh Oasis, Western Desert of Egypt". Palaeontology. 44 (2): 305–323. doi:10.1111/1475-4983.00181. ISSN0031-0239.