Proceedings of the American Philosophical Society 17:242-246* Cope, E. D., 1878, On the vertebrata of the Dakota Epoch of Colorado: Paleontological Bulletin, n. 28, p. 233-247.
Proceedings of the American Philosophical Society 17:242-246* "Cope, E. D.", 1878, On the vertebrata of the Dakota Epoch of Colorado: Paleontological Bulletin, n. 28, p. 233—247.