^Ryan, M.J.; Evans, D.C.; Shepherd, K.M.; Sues, H. (2012). “A new ceratopsid from the Foremost Formation (middle Campanian) of Alberta”. Canadian Journal of Earth Sciences49 (10): 1251. doi:10.1139/e2012-056.
^ abcFiorillo, A.R. & Tykoski, R.S. (2012). “A new Maastrichtian species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope of Alaska”. Acta Palaeontologica Polonica57 (3): 561. doi:10.4202/app.2011.0033.
^Gilmore, C.W. (1930). “On dinosaurian reptiles from the Two Medicine Formation of Montana”. Proceedings of the United States National Museum77 (16): 1–39. doi:10.5479/si.00963801.77-2839.1.
^Fiorillo, A.R. & Gangloff, R.A. (2001). “Theropod teeth from the Prince Creek Formation (Cretaceous) of northern Alaska, with speculations on Arctic dinosaur paleoecology”. Journal of Vertebrate Paleontology20 (4): 675–682. doi:10.1671/0272-4634(2000)020[0675:TTFTPC]2.0.CO;2.