Richard J. Butler, Paul Upchurch and David B. Norman. The phylogeny of the ornithischian dinosaurs. Journal of Systematic Palaeontology. 2008, 6 (1): 1–40. doi:10.1017/S1477201907002271.
Richard J. Butler, Jin Liyong, Chen Jun, Pascal Godefroit. The postcranial osteology and phylogenetic position of the small ornithischian dinosaur Changchunsaurus parvus from the Quantou Formation (Cretaceous: Aptian–Cenomanian) of Jilin Province, north-eastern China. Palaeontology. 2011, 54 (3): 667–683. doi:10.1111/j.1475-4983.2011.01046.x.
