Ch. W. Gilmore: Ceratopsian dinosaurs from the Two Medicine Formation, Upper Cretaceous of Montana. In: Proceedings of the United States National Museum, Band 87, Nummer 3066, 1939, S. 1–18, (Digitalisat).
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Ch. W. Gilmore: On dinosaurian reptiles from the Two Medicine Formation of Montana. In: Proceedings of the United States National Museum, Band 77, 1930, S. 1–39, (Digitalisat)
A. T. McDonald & J. R. Horner: New material of ‘‘Styracosaurus’’ ovatus from the Two Medicine Formation of Montana. In: M. J. Ryan, B. J. Chinnery-Allgeier & D. A. Eberth (Hrsg.): New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium, Indiana University Press, 2010, ISBN 978-0-253-35358-0, S. 156–168, (Leseprobe).
G. S. Paul: The Princeton Field Guide to Dinosaurs. 2. Auflage, Princeton University Press, 2016, ISBN 978-0-691-16766-4, S. 291, (Leseprobe).
R. R. Rogers, C. C. Swisher III & J. R. Horner: 40Ar/39Ar age and correlation of the nonmarine Two Medicine Formation (Upper Cretaceous), northwestern Montana, U.S.A. In: Canadian Journal of Earth Sciences, Band 30, 1993, S. 1066–1075, (Digitalisat).
R. R. Rogers: Taphonomy of Three Dinosaur Bone Beds in the Upper Cretaceous Two Medicine Formation of Northwestern Montana: Evidence for Drought-Related Mortality. In: Palaios, Band 5, 1990, S. 394–413, (Digitalisat).
