Literature
  • Bour, Pauler 1987
  • Identite de Phrynops vanderhaegei Bour, 1973, et des especies affines. (Reptilia-Chelonii-Chelidae). Mesogee 47: 3-23.
  • 1830-1835
  • Illustrations of Indian Zoology. Vols. 1, 2. London.
  • 1838-1849
  • Illustrations of the zoology of South Africa, consisting chiefly of Figures and Descriptions of the Objects of Natural History collected during an Expedition into the Interior of South Africa, in the years 1834, 1835 and 1836. Vol. 3. Reptilia. Smith, Elder & Co., London. 28 pp.
  • 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.
  • 1832-1833
  • In: G. Bibron and J. B. G. M. Bory de Saint-Vincent. Reptiles et Poissons. Exped. Sci. Morée., Paris et Stassbourg 3(1): 1-209.
  • 1836
  • In: G. White, The Natural History and Antiquities of Selborne, p. 361.
  • , 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.
  • 1979
  • Indian Ocean giant tortoises: their systematics and island adaptations. Phil. Trans. Royal Soc. London, B 286: 127-145.
  • 1985
  • Indian Turtles: A Field Guide. World Wildlife Fund—India Eastern Region, Calcutta. 119 pp.
  • 1989
  • Individual DNA fingerprints from Galapagos tortoises Geochelone elephantopus. Int. Zoo Yearb. 28: 84-87.
  • 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.
  • 1958
  • Intergradation between two subspecies of painted turtle, genus Chrysemys. Copeia
  • 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.
  • 1998
  • Introduction to zoogeography and subspecific differentiation in Emys orbicularis (Linnaeus, 1758). In: U. Fritz, U. Joger, R. Podloucky and J. Servan (eds.), Proceedings of the EMYS Symposium Dresden 96. Mertensiella 10: 1-27.
  • , 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.