Richard J. Butler, Peter M. Galton. The 'dermal armour' of the ornithopod dinosaur Hypsilophodon from the Wealden (Early Cretaceous: Barremian) of the Isle of Wight: a reappraisal. „Cretaceous Research”. 29 (4), s. 636–642, 2008. DOI: 10.1016/j.cretres.2008.02.002. (ang.).
David B. Weishampel, Coralia-Maria Jianu, Z. Csiki, David B. Norman. Osteology and phylogeny of Zalmoxes (n.g.), an unusual euornithopod dinosaur from the latest Cretaceous of Romania. „Journal of Systematic Palaeontology”. 1 (2), s. 1–56, 2003. DOI: 10.1017/S1477201903001032. (ang.).
Richard J. Butler, Roger M. H. Smith, David B. Norman. A primitive ornithischian dinosaur from the Late Triassic of South Africa, and the early evolution and diversification of Ornithischia. „Proceedings of the Royal Society B: Biological Sciences”. 274, s. 1361, 2007. DOI: 10.1098/rspb.2007.0367. (ang.).
Richard J. Butler, Paul Upchurch, David B. Norman. The phylogeny of the ornithischian dinosaurs. „Journal of Systematic Palaeontology”. 6 (1), s. 1–40, 2008. DOI: 10.1017/S1477201907002271. (ang.).
Peter M. Galton. The ornithopod dinosaur Dryosaurus and a Laurasia-Gondwanaland connection in the Upper Jurassic. „Nature”. 268, s. 230–232, 1977. DOI: 10.1038/268230a0. (ang.).
