Literature
- Cope, E. D. 1864. On the limits and relations of the Raniformes. Proc. Acad. Natur. Sci. Philadelphia 16: 181-183.
- Gaffney, E. S. 1975b. A phylogeny and classification of the higher categories of turtles. Bull. Amer. Mus. Natur. Hist. 155: 387-436.
- Romer, A. S. 1956. Osteology of the reptiles. Univ. Chicago Press, Chicago, Illinois. 772 pp.