- Rainbolt 1996
- Geochelone gigantea (Aldabra giant tortoise). Predation. Herpetol. Rev. 27: 199.
- Rakotoniaina 1996
- Comment faire participer la population locale de la region de la Baie de Baly a la conservation de l'Angonoka, Geochelone yniphora? In: B. Devaux (ed.), Proceedings—International Congress of Chelonian Conservation, pp. 141-143. Gonfaron, France: Editions SOPTOM.
- Rall, Fairall 1993
- Diets and food preferences of two South African tortoises Geochelone pardalis and Psammobates oculifer. S. Afr. J. Wildl. Res. 23: 63-70.
- Ramo 1982
- Biología del galapago (Podocnemis vogli Müller, 1935) en el Hato El Frio. Doñana Acta Vertebrata 9: 1-161.
- , 1987
- Notes on comparative body sizes, reproductive effort and areas of management priorities for three species of Kachuga (Reptilia: Chelonia) in the National Chambal Sanctuary. J. Bombay Nat. Hist. Soc. 84: 55-56.
- Rebel 1974
- Sea turtles and the turtle industry of the West Indies, Florida, and the Gulf of Mexico. Univ. Miami Press. 250 pp.
- , Seidel 1982
- Sternotherus odoratus. Catalog. Amer. Amphib. Rept. 287: 1-4.
- , Seidel 1983
- Morphological homogeneity in the turtle Sternotherus odoratus (Kinosternidae) throughout its range. J. Herpetol. 17: 113-120.
- Rhodin 1994b
- Chelid turtles of the Australian Archipelago: II. A new species of Chelodina from Roti Island, Indonesia. Breviora (498): 1-31.
- Rhodin 1994a
- Chelid turtles of the Australian Archipelago: I. A new species of Chelodina from southeastern Papua, New Guinea. Breviora (497): 1-36.
- Rhodin 1996
- Status and conservation of Chelodina mccordi, an isolated and restricted freshwater turtle from Roti Island, Indonesia. In: B. Devaux (ed.), Proceedings—International Congress of Chelonian Conservation, p. 67. Gonfaron, France: Editions SOPTOM.
- Rhodin, 1997
- The painted turtles (Chrysemys picta) of New England: taxonomy, morphometrics, and reproduction. In: T. Tyning. (ed.), Status and conservation of turtles of the northeastern United States: a symposium, pp. 34-40. Serpent's Tale, Lanesboro, Minnesota.
- Rhodin, Mittelhauser 1994
- Maximum size and clutch size records for eastern painted turtles, Chrysemys picta picta, from mid-coastal Maine. Chelonian Conserv. Biol. 1(2): 148-150.
- Rhodin, 1982
- The original authorship and type specimen of Dermochelys coriacea. J. Herpetol. 16: 316-317.
- Rhodin, 1976
- Chelodina parkeri, a new species of chelid turtle from New Guinea, with a discussion of Chelodina siebenrocki Werner, 1901. Bull. Mus. Comp. Zool. Harvard 147: 465-488.
- Rhodin, 1983
- Description of Phrynops williamsi, a new species of chelid turtle of the South American P. geoffroanus complex. In: A. G. J. Rhodin and K. Miyata (eds.), Advances in Herpetology and Evolutionary Biology, pp. 58-73. Mus. Comp. Zool. Harvard. Cambridge, Mass.
- Rhodin, 1977
- Neural bones in chelid turtles from Australia and New Guinea. Copeia
- Rhodin, McCord 1990
- Reproductive data on the chelid turtle Chelodina siebenrocki from New Guinea. Herpetol. Rev. 21(3): 51-52.
- Rhodin 1981
- The occurrence of neustophagia among podocnemine turtles. British J. Herpetol. 6: 175-176.
- Rhodin 1978
- Karyotypic analysis of the Podocnemis turtles. Copeia
- Rhodin 1990
- Acanthochelys macrocephala. Catalog. Amer. Amphib. Rept. 481: 1-2.
- Rhodin 1984
- Platemys macrocephala, a new species of chelid turtle from central Bolivia and the Pantanal Region of Brazil. Herpetologica 40: 38-46.
- Rhodin 1993
- Distribution, osteology, and natural history of the Asian giant softshell, Pelochelys bibroni, in Papua New Guinea. Chelonian Conserv. Biol. 1: 19-30.
- Rhodin 1982
- Distribution and taxonomic status of Phrynops hogei, a rare chelid turtle from southeastern Brazil. Copeia
- Richmond 1964
- The mechanical functions of the testudinate plastron. Amer. Midl. Natur. 72: 50-56.
- Richmond 1958
- The status of the Florida snapping turtle Chelydra osceola Stejneger. Copeia
- Risley 1933
- Observations on the natural history of the common musk turtle, Sternotherus odoratus (Latreille). Pap. Michigan Acad. Sci. Arts.-Lett. 17: 685-711.
- Risley 1938
- Seasonal changes in the testes of the musk turtle, Sternotherus odoratus L. J. Morphol. 63: 301-317.
- Risley 1934
- The activity of the coelomic (germinal) epithelium of the male musk turtle, Sternotherus odoratus (Latreille). J. Morphol. 56: 59-99.
- Ritgen 1828
- Versuch einer natürlichen Enteilung der Amphibien. Nova Acta Physico-Medica Acad. Caes. Leopold.-Carol. Natur. Curio. 14: 246-284.
- Rochat 1962
- Foods and feeding. Water tortoise Pelomedusa subrufa. Lammergeyer 2: 69.
- Rödel 1985
- Zum Verhalten von Sacalia bealei (Gray, 1831). Salamandra 21(2/3): 123-131.
- Rödel, Grabow 1995
- Die Schildkröten und Krokodile des Comoé-Nationalparks, Elfenbeinküste (Reptilia: Testudines et Crocodylia). Faun. Abh. St. Mus. Tierk. Dresden 20(8): 133-144.
- Rödel 1997
- Lebensräume und Entwicklung junger Starrbrust-Pelomedusen Pelomedusa subrufa olivacea (Schweigger, 1812) im Comoé-Nationalpark, Elfenbeinküste (Testudines: Pelomedusidae). Herpetozoa 10(1/2): 23-33.
- Rödel 1989
- Pflege und Zucht der ostafrikanischen Klappbrustpelomeduse Pelusios williamsi williamsi. Die Aquarien- und Terrarien-Zeitschr. (DATZ) 7: 409-412.
- Rodhouse 1975
- The feeding and ranging behaviour of Galapagos giant tortoises (Geochelone elephantopus): the Cambridge and London University Galapagos Expeditions, 1972 and 1973. J. Zool. London 176: 297-310.
- Rogner 1996
- Schildkröten 2. Heidi Rogner-Verlag, Hürtgenwald. 265 pp.
- Roosenburg, Dunham 1997
- Allocation of reproductive output: egg- and clutch-size variation in the diamondback terrapin. Copeia
- , Judd 1989
- Gopherus berlandieri. Berlandier's tortoise, Texas tortoise. In: I. R. Swingland, and M. W. Klemens (eds.). The Conservation Biology of Tortoises, pp. 8-9. Occ. Pap. IUCN/SSC 5, Tortoise and Freshwater Specialists Group. IUCN, Gland, Switzerland.
- , Judd 1991
- Egg size versus carapace—xiphiplastron aperture size in Gopherus berlandieri. J. Herpetol. 25: 248-250.
- , Judd 1982
- The biology and status of Berlandier's tortoise (Gopherus berlandieri). In: R. B. Bury (ed.), North American tortoises: conservation and ecology, pp. 57-70. U. S. Fish Wildl. Serv. Res. Rep. 12.
- , 1990
- Habitat use, movements, and nesting ecology of Emydoidea blandingii in central Wisconsin. J. Herpetol. 24: 6-12.
- Rostal 1996
- Reproductive physiology of nesting leatherback turtles (Dermochelys coriacea) at Las Baulas National Park, Costa Rica. Chelonian Conserv. Biol. 2: 230-236.
- Rostal 1994
- Seasonal reproductive cycle of the desert tortoise (Gopherus agassizii) in the eastern Mojave Desert. Herpetol. Monogr. 8: 72-82.
- Rotmans, Rotmans-Zwaal 1994
- Een geslaagde kweek van de driekielstraalschildpad (Geoclemys hamiltonii). Lacerta 53(1): 11-17.
- , Moll 1991
- A radiotelemetric study of activity and movements of the Blanding's turtle (Emydoidea blandingii) in northeastern Illinois. J. Herpetol. 25: 178-185.
- Roze 1964
- Pilgrim of the river. Natural History 73: 34-41.
- Rudloff 1986
- Beitrag zur Kenntnis der Zacken-Erdschildkrote Geoemyda spengleri (Gmelin, 1789). Herpetofauna 8(40): 14-20.
- Rudloff 1990
- Vermehrung von Terrarientieren. Schildkröten. Urania Verlag, Leipzig, Jena, Berlin. 155 pp.
- Rummler, 1991
- Geographische Variabilität der Amboina-Scharnierschildkröte Cuora amboinensis (Daudin, 1802), mit Beschreibung einer neuen Unterart, C. a. kamaroma subsp. nov. Salamandra 27: 17-45.