^Mark J. MacDougall and Robert R. Reisz. The first record of a nyctiphruretid parareptile from the Early Permian of North America, with a discussion of parareptilian temporal fenestration. Zoological Journal of the Linnean Society. 2014, 172 (3): 616–630. doi:10.1111/zoj.12180.
Carroll, R. L., 1988: Appendix; Vertebrate Classification. in Carroll, R. L. 1988: Vertebrate Paleontology and Evolution, W. H. Freeman and company, New York
deBraga M. & O. Rieppel. 1997. Reptile phylogeny and the interrelationships of turtles. Zoological Journal of the Linnean Society 120: 281-354.
deBraga, M. & Reisz, R. R., 1996: The Early Permian reptile Acleistorhinus pteroticus and its phylogenetic position. Journal of Vertebrate Paleontology: Vol. 16, #3, pp. 384–395
Lee, M. S. Y. 1995. Historical burden in systematics and the interrelationships of 'Parareptiles'. Biological Reviews of the Cambridge Philosophical Society 70: 459-547.
Lee M. S. Y. 1996. Correlated progression and the origin of turtles. Nature 379: 812-815.
Lee, M. S. Y., 1997: Pareiasaur phylogeny and the origin of turtles. Zoological Journal of the Linnean Society: Vol. 120, pp. 197–280
Rieppel O. & M. deBraga. 1996. Turtles as diapsid reptiles. Nature 384: 453-455.