Gregory, Joseph T. (1952): The Jaws of the Cretaceous Toothed Birds, Ichthyornis and Hesperornis. Condor54(2): 73-88. PDF fulltext
Marsh, Othniel Charles (1880): Odontornithes, a Monograph on the Extinct Toothed Birds of North America. Government Printing Office, Washington DC.
Mortimer, Michael (2004): The Theropod Database: Phylogeny of taxa. Retrieved 2008-AUG-14.
Thomson, Keith Stewart (2008). The Legacy of the Mastodon: The Golden Age of Fossils in America. Yale University Press. ISBN0300117043.
Wallace, David Rains (1999). The Bonehunters' Revenge: Dinosaurs, Greed, and the Greatest Scientific Feud of the Gilded Age. Houghton Mifflin Books. ISBN0618082409.
