Benson, R. B. J. (2012). "Interrelationships of basal synapsids: Cranial and postcranial morphological partitions suggest different topologies". Journal of Systematic Palaeontology. 10: 601–624. doi:10.1080/14772019.2011.631042.
Romer, A.S.; Price, L.I. (1940). "Review of the Pelycosauria". Geological Society of America Special Paper. 28: 1–538. doi:10.1130/spe28-p1.