A. Prieto-Márquez, “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, vol. 2765, no. 1, pp. 61–68, Feb. 2011.