スファエロトルス
1 2 3 Carr, T. E. and Williamson, T. D. 2002. "A new genus of highly derived pachycephalosaurian from western North America". Journal of Vertebrate Paleontology 22(4):779-801.
↑ Robert M. Sullivan (2003). “Revision of the dinosaur Stegoceras Lambe (Ornithischia, Pachycephalosauridae)”. Journal Of Vertebrate Paleontology 23 (1): 181–207. doi:10.1671/0272-4634(2003)23[181:rotdsl]2.0.co;2.
↑ Brown, B. and E. M.