Wilson, J. P.; Ryan, M. J.; Evans, D. C. (2020). A new, transitional centrosaurine ceratopsid from the Upper Cretaceous Two Medicine Formation of Montana and the evolution of the 'Styracosaurus-line' dinosaurs. Royal Society Open Science. 7(4): 200284.
A new, transitional centrosaurine ceratopsid from the Upper Cretaceous Two Medicine Formation of Montana and the evolution of the '<i>Styracosaurus</i>-line' dinosaurs