Prieto-Márquez, A. 2011. Revised diagnoses of Hadrosaurus foulkii Leidy, 1858 (the type genus and species of Hadrosauridae Cope, 1869) and Claosaurus agilis Marsh, 1872 (Dinosauria: Ornithopoda) from the Late Cretaceous of North America. Zootaxa. 2765, 1 (Feb. 2011), 61–68. DOI:https://doi.org/10.11646/zootaxa.2765.1.6.