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Maryanska, T., Chapman, R., & Weishampel, D.(2004-06-12). Pachycephalosauria. In The Dinosauria. : University of California Press. Retrieved 21 Jan. 2018, from http://california.universitypressscholarship.com/view/10.1525/california/9780520242098.001.0001/upso-9780520242098-chapter-24.