D.E. Fastovsky and D. B. Weishampel, The Evolution And Extinction Of The Dinosaurs; Cambrige University Press, 1996.

J. H. Ostrom and J. S. McIntosh, Marsh's Dinosaurs, The Collection From Como Bluff; New Haven and London, Yale University Press, 1966.

K. Carpenter and P. J. Currie,Dinosaur Systematics Approaches and Perspectives; Cambridge University Press, 1990.

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