↑(en) Andrew A. Farke, W. Desmond Maxwell, Richard L. Cifelli et Mathew J. Wedel, « A Ceratopsian Dinosaur from the Lower Cretaceous of Western North America, and the Biogeography of Neoceratopsia », PLOS ONE, vol. 9, no 12, , e112055 (ISSN1932-6203, PMID25494182, PMCIDPMC4262212, DOI10.1371/journal.pone.0112055, lire en ligne, consulté le )