• [Wiki] http://en.wikipedia.org/wiki/Psittacosaurus.
• [ErikMako2009] Erickeson, G. M., Makovicky, P. J., Inouye, B. D., Zhou, C.-F., and Gao, A.-Q. (2009). A life table for Psittacosaurus lujiatunensis: Initial insights into ornithischian dinosaur population biology. The Anatomical Record, 292:1514–1521. doi:10.1002/ar.20992.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.