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Goodwin i Horner 2004 Goodwin, MB; Horner, JR. Lipanj 2004. Cranial histology of pachycephalosaurs (Ornithischia: Marginocephalia) reveals transitory structures inconsistent with head-butting behavior. Paleobiology. 30 (2): 253–267. doi:10.1666/0094-8373(2004)030<0253:CHOPOM>2.0.CO;2
Lehman 2010 Lehman, TM. 2010. Pachycephalosauridae from the San Carlos and Aguja Formations (Upper Cretaceous) of west Texas, and observations of the frontoparietal dome. Journal of Vertebrate Paleontology. 30 (30): 786–798. doi:10.1080/02724631003763532. ISSN0272-4634
Lehman 2010 Lehman, TM. 2010. Pachycephalosauridae from the San Carlos and Aguja Formations (Upper Cretaceous) of west Texas, and observations of the frontoparietal dome. Journal of Vertebrate Paleontology. 30 (30): 786–798. doi:10.1080/02724631003763532. ISSN0272-4634