Scannella, John. “A Chasmosaurine Ceratopsid Premaxilla from the Basal Sandstone of the Hell Creek Formation, Montana”. Vertebrate Anatomy Morphology Palaeontology 8, no. 1 (November 10, 2020): 154–169. Accessed October 11, 2024. https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29366.