Robert T. Bakker (1986), The Dinosaur Heresies, Kensington Publishing Corp.
Cox, B. and Savage, R.J.G. and Gardiner, B. and Harrison, C. and Palmer, D. (1988) The Marshall illustrated encyclopedia of dinosaurs & prehistoric animals, 2nd Edition, Marshall Publishing
Carol Lane Fenton and Mildred Adams Fenton (1958) The Fossil Book, Doubleday Publishing
Hore, P.M. (2005), The Dinosaur Age, Issue #18. National Dinosaur Museum
Denise Sigogneau-Russell, 1989, "Theriodontia I - Phthinosuchia, Biarmosuchia, Eotitanosuchia, Gorgonopsia" Part 17 B I, Encyclopedia of Paleoherpetology, Gutsav Fischer Verlag, Stuttgart and New York