- Bour, Pauler 1987
- Identite de Phrynops vanderhaegei Bour, 1973, et des especies affines. (Reptilia-Chelonii-Chelidae). Mesogee 47: 3-23.
- Falcoff, Fanconnier 1965
- In vitro production of an interferon-like inhibitor of viral multiplication by a poikilothermic animal cell, the tortoise (Testudo graeca). Proc. Soc. Exp. Biol. Med. 118: 609-612.
- , 1968
- Incubation of eggs of three species of chelid tortoises, and notes on their embryological development. Australian J. Zool. 16: 749-761.
- , 1994
- Incubation temperature influences sex and hatchling size in the neotropical turtle Podocnemis unifilis. J. Herpetol. 28(4): 453-464.
- Judd, McQueen 1980
- Incubation, hatching, and growth of the tortoise, Gopherus berlandieri. J. Herpetol. 14: 377-380.
- Cayot, Márquez 1994
- Informacion sobre las poblaciones de Galápagos en Isabela. Carta Informativa, Estacion Cientifica Charles Darwin 38: 3.
- Esque, 1994
- Ingestion of bones, stones, and soil by desert tortoises. In: R. B. Bury and D. J. Germano (eds.), Biology of North American tortoises, pp. 105-111. U. S. Fish Wildl. Serv. Res. Rep. 13.
- Baard 1996a
- Inter- and intra-individuals variation in the measurement of a southern padloper Homopus areolatus shell. African Herpetol. News (25): 22-25.
- Ernst 1967a
- Intergradation between the painted turtles Chrysemys picta picta and Chrysemys picta dorsalis. Copeia 1967: 131-136.
- Feuer 1971
- Intergradation of the snapping turtles Chelydra serpentina serpentina (Linnaeus, 1758) and Chelydra serpentina osceola Stejneger 1918. Herpetol. 3: 113-119.
- Pritchard 1973
- International migrations of South American sea turtles (Cheloniidae and Dermochelidae). Animal Behav. 21: 18-27.
- , Gruss 1986
- Investigaciones primarias sobre biología y comercio de Geochelone chilensis (Gray, 1870). Etapa 1. Grupo Herpetofauna, Fundación Vida Silvestre Argentina. 72 pp.
- Taskavak 1992
- Investigations on the morphology and osteology, biotope and distribution in Anatolia of Rafetus euphraticus (Reptilia, Testudines), with some observations on its biology. Ph.D. Dissertation, Ege Univ., Bornova-Izmir. 177 pp. [in Turkish]
- Atatür 1979
- Investigations on the morphology and osteology, biotope and distribution in Anatolia of Trionyx triunguis (Reptilia, Testudines) with some observations on its biology. Ege Univ. Fen. Fak. Monogr., Izmir, Ser. 18: 1-75.
- Cann 1997c
- Irwin's turtle, Elseya irwini sp. nov. Vic. Herp. Soc. Inc. "Monitor" 9(1): 36-40.
- , 1996
- IUCN Red List of Threatened Animals. IUCN Cambridge, UK, and Gland, Switzerland.