New Perspectives on Horned DinosaursBrenda J. Chinnery-Allgeier, David A. Eberth, Patricia E. Ralrick, Peter Dodson, Michael J. Ryan · First published 2010Open the Tome
The skull of Sphenacodon ferocior, and comparisons with other Sphenacodontines (ReptiliaDavid A. Eberth · First published 1985Open the Tome
"The interrelationships of pelycosaurs" Breviora (Cambridge, Ma. : 29 April 1983) Number 473Donald B. Brinkman, David A. Eberth · First published 1983Open the Tome
