Carpenter, Kenneth; Breithaupt, Brent H. (1986). "Latest Cretaceous occurrences of nodosaurid ankylosaurs (Dinosauria, Ornithischia) in Western North America and the gradual extinction of the dinosaurs". Journal of Vertebrate Paleontology. 6 (3): 251–257. doi:10.1080/02724634.1986.10011619.
