Literature
- Ernst, C. H., J. E. Lovich, and R. W. Barbour. 1994. Turtles of the United States and Canada. Smithsonian Inst. Press, Washington and London, 578 pp.
- Ernst, C. H., and R. W. Barbour. 1972. Turtles of the United States. Univ. Press Kentucky, Lexington. 347 pp.
- Gaffney, E. S. and P. A. Meylan. 1988. A phylogeny of turtles. In: M. J. Benton (ed.), The Phylogeny and Classification of the Tetrapods, vol. 1, Amphibians, Reptiles, Birds, pp. 157-219. System Assoc. Spec. Vol. 35A, Clarendon Press, Oxford, England.
- McDowell, S. B. 1964. Partition of the genus Clemmys and related problems in the taxonomy of the aquatic Testudinidae. Proc. Zool. Soc. London 143: 239-279.