^"Table 20.1," in Weishampel, et al. (2004). Page 442.
^Longrich, Nicholas R. (2016). "A ceratopsian dinosaur from the Late Cretaceous of eastern North America, and implications for dinosaur biogeography". Cretaceous Research. 57: 199–207. doi:10.1016/j.cretres.2015.08.004.
Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN0-520-24209-2.