Campbell, J. A., Ryan, M. J., Schroder-Adams, C. J., Holmes, R. B., & Evans, D. C. (2019). Temporal range extension and evolution of the chasmosaurine ceratopsid ‘Vagaceratops’ irvinensis (Dinosauria: Ornithischia) in the Upper Cretaceous (Campanian) Dinosaur Park Formation of Alberta. Vertebrate Anatomy Morphology Palaeontology, 7, 83–100. https://doi.org/10.18435/vamp29356