Literature
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- Haynes, D. 1976. Graptemys caglei. Catalog. Amer. Amphib. Rept. 184: 1-2.
- Haynes, D., and R. R. McKown. 1974. A new species of map turtle (genus Graptemys) from the Guadalupe River system in Texas. Tulane Stud. Zool. Bot. 18: 143-152.
- Killebrew, F. 1977a. Mitotic chromosomes of turtles. IV. The Emydidae. Texas J. Sci. 29: 245-253.
- McKown, R. R. 1972. Phylogenetic relationships within the turtle genera Graptemys and Malaclemys. Ph.D. Diss., Univ. Texas, Austin, Texas.
- Wibbels, T., F. C. Killebrew, and D. Crews. 1991. Sex determination in Cagle's map turtle: Implications for evolution, development, and conservation. Can. J. Zool. 69: 2693-2696.