* Marsh, O. C., 1889, Comparison of the principal forms of the Dinosauria of Europe and America: American Journal of Science, 3rd series, v. 37, p. 323-331.
* "Marsh, O. C.", 1889, Comparison of the principal forms of the Dinosauria of Europe and America: American Journal of Science, 3rd series, v. 37, p. 323—331.