Prothero, D.R.; Schoch, R.M. 2002. Horns, tusks & flippers: the evolution of hoofed mammals. Baltimore and London, John Hopkins University Press.
Prothero, D.R.; Schoch, R.M. 1989. The evolution of perissodactyls. New York and London, Clarendon Press and Oxford University Press. pp. i-viii, 1-537.
Prothero, D.R.; Schoch, R.M. 1989. Classification of the Perissodactyla.
Prothero, D.R.; Schoch, R.M. 1989. Origin and evolution of the Perissodactyla: summary and synthesis.
Lucas, S.G.; Schoch, R.M. 1981. The systematics of Rhodopagus, a Late Eocene hyracodontid (Perissodactyla: Rhinocerotoidea) from China. Bulletin of the Geological Institute of Uppsala NS 9: 43-50, 5 figs, 1 tab..






