Amato, A.F. and Morato S.A.A., 1991. Notas biologicas e localidades de registro de Plateyms spixii (Dumétil & Bibron, 1835) (Testudines: Chelidae) para o estado do Parana, Brasil. Acta Biologica Leopoldensia 13(2):119-130.
Aquino et al., Colecciones de Flora y Fauna del Museo Nacional de Historia Natural del Paraguay, Inventario Biologica Nacional / MNHNP / DPNVS / SSERNMA / MAG Asuncion, 1996: 385-386.
Artner H., 2007. Observations in the Natural Habitat in Paraguay and their Implications for the First Succesdful Breeding of the Pantanal Swamp Turtle Acanthochelys macrocephala (Rhodin, Mittermeier & McMorris, 1984). Emys, 14(3): 4-25.
Bakowskie R., et R., 2008. Hybrids of Phrynops geoffroanus (Schweigger, 1812) and Phrynops hilarii (Dumétil & Bibron, 1835) in captivity. Radiata 17 (3): 69-72.
Bernardes A. T. and Moreira G., 1994. Boletim Infomativo
do Grupo de Estudos de Quelônios do Brasil (GEQB), Chelonia Neotropica 1 (1).
Bertoni A. W., 1914. Fauna Paraguaya: Catalogos sistematicos de los vertebrados del Paraguay: Peces, Batracios, Reptiles, Aves y Mamiferos Concidos Hasta 1913. Moises’s Bertoni, Asuncion.
Bickham J.W., Hanks J.W., Hale D.W. and Martin J.E., 1993. Ploidy diversity and the production of balanced gametes im male twist-necked turtles (Platemys platycephala), Copeia 199(3): 723-727.
Blanvillain R., 2005. Husbandry and Propagation of the South American Snake-necked Turtle, Platemys platycephala (Schneider, 1792). Radiata 14(4): 25-28.
Böhm S., 2008. Considerations regarding a near-natural Husbandry of the Tuberose Side-necked Turtle, Phrynops tuberosus (Peters, 1870). Radiata 17 (3): 45-54.
Bour, R., et Pauler, I., 1987. Identité de Phrynops vanderhaegei Bour, 1973, et des espèces affines (Reptilia - Chelonii - Chelidae), Mesogee, vol. 47:3-23.
Bour, R. 2008., Types of Three Species of Sideneck Turtle Belonging of the Genus Phrynops Wagler, 1830: Emys geoffroana Schweigger, 1812, Platemys hilarii Duméril & Bibron, 1835 and Platemys waglerii Duméril & Bibron, 1835, Emys 15 (2): 35-41.
Brasil M.A., 2008. Ecologia alimentar de Acanthochelys spixii (Testudines, Chelidae) no Parque Nacional de Brasilia, Distrito Federal. Universidade de Brasilia, Instituto de Ciencias Biologicas, Programma de Pos-Graduaçao em Biologia animal: 37p.
Brites V.L.C.de & Rantin F.T., 2004. the influence of agricultural and urban contamination on leech infestation of freshwater Turtles, Phrynops geoffroanus, taken from two areas of the uberabinha river, Environmental Monitoring and Assessment 96: 23-281.
Buskirk J., 1991. The Spiny-Neck Turtle (Platemys spixii) in and out of captivity , The Vivarium, 3 (2): 16-17 ; 30-31.
Buskirk R. J., 1988. New locality records in Argantina and Paraguay for Chelid Turtles Platemys pallidipectoris (Freiberg) and Platemys macrocephala (Rhodin et Al.) , Herp Review 19(4): .
Buskirk R. J., Field Observations on Phrynops williamsi and Other Urugayan Chelonians , Vivarium: 8-11.
Cabrera M.R., Haro J.G. and Monguillot J.C., 1986. Presencia de Hydromedusa tectifera y Phrynops hilarii (Testudines: Chelidae) en la provencia de Cordoba, Argentina , Acad. Nac. Cienc. (Cordoba, Argen tina) M isc., 73: 1-10.
Cabrera, M. R., 1993. Geographic distribution: Phrynops williamsi (Testudines). Herpetol. Review 24 (2): 65-66.
Cabrera, M.R., 1995. Comparative composition of turtle species in four natural regions of the Chacoan Domain, South America. Anales Mus. Hist. Nat. Valparaíso, 23: 41-52.
Cabrera, M.R., 1998. Las Tortugas continentales de Sudamérica Austral , Mario R. Cabrera publ. : 108 p.
Carrillo G., Parilla R., Souza C. et al., 1999. Valor nutritivo de cuatro variedades de came de monte de mayor consumo en la de Iquitos, IV Congresso Internacional sobre Manejo de Fauna silvestre en Amazonia y Latinoamérica, Asuncion, PY.
Collectif, 2002-2007. A Global Action Plan for Conservation of Tortoises and Freshwater Turtles: Strategy and Funding Prospectus: 30 p.
Dall’Antonia, L. et al., 2001. Data loggers to monitor activity in wild freshwater turtles. – Ethol. Ecol. Evol., 13 (1): 81-88.
Daszkiewicz P. et Massary J.C., 2008. L'herpétofuane de la Guyane française à travers les mémoires de Konstaty Jeleski de 1865 - 1869. Bull. Soc. Herp. Fr. 125: 5-31.
Derr J.N., Bickham J.W., Greenbaum I.F, Rhodin A.G.J. and Mittermeier R.A., 1987. Biochemical systematies and evolution in the South American turtles genus Platemys (Pleurodira: Chelidae), Copeia (2): 370-375.
Duellman W.E, and Salas A.W., 1991. Annotated checklist of the amphibians and reptiles of Cuzco Amazonico, Peru, Museum of Natural History, University of Kansas, Number 143: 1-13.
Fabius D., and Philippen H.D., 2007. Welterstzucht der brasilianischen Schlangenhalsschildkröte, Hydromedusa maximiliani (Mikan, 1820). Marginata 14, 4 (2): 58-59.
Freiberg M. A., 1954. Vida de Batracios Y Reptiles sudamericanos, Cesarini Hnos, Buenos Aires. :192p.
Freiberg M., 1977. Fauna de agua dulce de la Republica Argentina, vol. 1, testudines o Chelonia / vol. 2, crocodilia o Loricata. FECIC Fundaction para la Educacion, la Ciencia y la Cultura, Buenos Aires: 95p.
Freiberg, M., 1981. Turtles of south America, t.f.h. publications: 125pp.
Freitas M.A., and Silva T.F.S., 2007. A Herpetofauna das Caatingas e Areas de altitudes do Nordeste Brasileiro. Biogeographia Publicaçoes e Consultoraia Ambiental, Bahia. Edit. USEB: 388 p.
Fretey J., 1987. Les tortues de Guyanes française, Nature Guyanaise, SEPANGUY: 141p.
Fritz U. and Pauler I., 1992 Phrynops chacoensis spec. nov. (Reptilia, Chelidae), eine neue Krötenkopschildkröte , Mitt. Zool. Mus. Berl. 68,2, 299-307.
Fritz U. and Pauler I., 1992 Erstnachweis von Acanthochelys pallidipectoris (Freiberg, 1945) für Paraguay (Testudines: Pleurodira: Chelidae) , HERPETOZOA Wien 5 (3/4): 135-137.
Fritz, U., 1995. Phrynops hilarii ist kein reiner Fleischfresser!. DATZ 48(1):7.
Fritz U. & Pauler I., 1999. Phrynops chacoensis Fritz & Pauler, 1992, ein Juniorsynonym von Platemys macrocephala Rhodin, Mittermeier & McMorris, 1984 , Salamandra, Rheinbach, 35(1): 53-56.
Gray J.E. 1825. A Synopsis of the Genera of Reptiles and Amphibia with a description of some new species, Annals of Philosophy ser. 2, vol. x: 193-217.
Gray J.E. 1852. Description of a New Genus and some New Species of Tortoises, Proc. of the Zool. Soc. of Londan: 133-135.
Gray,
J.E. 1855. Catalogue of Shield Reptiles in the Collection of the
British Museum. Part 1. Testudinata (Tortoises). Taylor and Francis,
London.: 72p., 42 pls.
Gray J.E. 1864. Additional Observations on Dermatemys, a Genus of Emydidae from Central Amercia, Proc. of the Zool. Soc. of London: 125-135.
Gray J.E. 1873. Observations on Chelonians, with Descriptions of new Genera and Species, Ann. & Mag. Nat. Hist. Ser. 4, Vol. 11: 289-308.
Grossmann P., and & Reimann M., 1991. Beiträge zum Verhalten und Nachzucht von Phrynops tuberculatus (Lüderwaldt, 1926) im Aqua-Terrarium , Sauria, Berlin, 13 (2): 3-6.
Grossmann P., 1986. Zur Haltung und Nachzucht von Phrynops hilarii, Sauria 8(2): 3-6.
Grossmann, P., 1989. Beiträge zur Haltung und Nachzucht der Buckelschildkröte Phrynops (Mesoclemmys) gibbus (Schweigger 1812), SAURIA, Berlin-W. 11(3): 11-15.
Grychta U. & Crychta R., 1995. Haltung und Zucht der Dunklen Krötenkopfschildkröte , Sauria, Berlin 17 (1): 11-14.
Kanberg, R., 1954. Die Schildkröten der Gattung Platemys , Das Aquarium, Berlin, (11): 64-65.
Karen M. B., Bickham J.W., Rhodin A. G. J., and Mittermeier R.A., 1985. Karyotypic Variation in the Genus Platemys (Testudines: Pleurodira), Copeia (2): 445-449.
Lovich E. Jeffrey and Ernst H. Carl, 1989. Variation in the Plastral Formulae of Selected Turtles with Comments on Taxonomic Utility , Copeia (2):304-318.
Lüling K.H., 1984. Die Schlangenhalsschildkröte Hydromedusa tectifera , herpetofauna 6(33):28-31.
Lüling K.H., 1984. Auf der Suche nach der Krötenkopfschildkröte , herpetofauna 6 (31).
Macé J.P., 2004. Les Phrynops Wagler, 1830 et l’élevage de Phrynops hilarii (Dumeril et Bibron, 1835), Situla, Rev. AFT, 10: 25-28.
Madec D, Maran J. & Le Gratiet G., 1993. La plus étrange des tortues, SOPTOM, La Tortue 23.
Magnan P. et Maran J., 1999. les Tortues passionnément , Encyclopédie Terrariophile, Tortues - vol. 1, JEH Productions: 84 p.
Magnusson W. E, De Lima A. C., Da Costa V. L. & Vogt R. C., 1997. Home Range of the Turtle, Phrynops rufipes, in an Isolated Reserve in Central Amazonia, Brazil , CC&B 2(4):494-499.
Magnusson W.E., De Lima A.C., Da Costa V.L., and De Lima O.P., 1997. Growth ot the Turtle, Phrynops rufipes, in Central Amazônia, Brazil , CC&B 2(4):576-581.
Medem F., 1973. Beiträge zur Kenntnis über die Fortpflanzune der Buckel-Schildkröte, Phrynops (Mesoclemys) gibbus, Salamandra, 9 3/4: 91-98, Frankfurt am Main.
Medem F., 1983. Reproductive Data on Platemys platycephala (Testudines: Chelidae) in Colombia , In Rhodin and Miyata: Advances in herp. and evol. bio. Essays in honor of E. W illiams, Cambridge: 429-434.
Meier H. and Schaefer I., 2003. Experiences and observations of Chelus fimbriatus, the maintenance in terrarium and successful reproduction, Radiata 12(2): 3-20.
Meier H., and Schaeffer I., 2008. The Matamata, Chelus fimbriata (Schneider, 1783).Field Observations, Husbandry and Breeding. Radiata 17 (3): 17-38.
Mertens, R., 1954. Bemerkenswerte Schildkröten aus Süd- und Zentralamerika, Die Aquarien- u- Terrarien-Ztschr. VII. 9., 1.9: 239-242.
Moll D. and Moll E.O., 2004. The Ecology, Exploitation, and Conservation of River Turtles, Oxford university press.: 393pp.
Molina F. B., 1990. Reproductiv Biology of Phrynops geoffroanus (Testudines: Chelidae) in Captivity , Tortoises & Turtles, 5: 8.
Molina, F.B., 1991. Some observations on the bilogy and behavior of Phrynops geoffroanus (Schweigger, 1812) in captivity (Reptilia, Testudines, Chelidae), Grupo Estud. Ecol. Ser. Doc. Sao Paulo 3:35-37.
Molina F. B., Observacoes sobre os habitos e o comportamento alimentar de Phrynops geoffroanus (Schweigger, 1812) em cativeiro (Reptilia, Testudines, Chelidae), Revta bras. Zool., 7(3): 319-326.
Molina F. B., 1996. Biologia e comportamento reprodutivo de quelonios , Anais de Etologia, 14: 211-221.
Molina F. B., 1997. Quando as aparêcias enganam: Os cagados da especie Hydromedusa tectifera , Chelonia (18): 4.
Molina F. B., 1997. Large-Scale Breeding of Turtles at Sao Paulo Zoo: Implications for Turtle Conservation in Brazil , Proc: Conservation, Restoration and Management of Tortoises and Turtles-an int. Conf.: 174-177.
Molina F. B., 1998. Comportemento e biologia reproductiva dos cagados Phrynops geoffroanus, Acanthochelys radiloata e Acanthochelys spixii (Testudines Chelidae) em cativeiro , Revista de Etologia, (n. especial): 25-40.
Molina F. B. and Da Rocha M. B., 1990. Reproductive Biologiy of Acanthochelys spixii (Testudines: Chelidae) in Captivity , Tortoises & Turtles, 5: 15.
Molina F. B., Da Rocha M. B. and De Mello L. L. A. B., 1998. Comportamento alimentar e dieta de Phrynops hilarii (Duméril & Bibron) em Cativeiro (Reptilia, Testudines, chelidae) , Revta bras. Zool. 15 (1): 73-79, 1
Monguillot J. C. and Fabius D., 1983. Contribucion al conocimiento de Platemys pallidipectoris Freiberg (Reptilia:Chelidae), Bol. Soc, Zool. Uruguay, 2 época, 8:198-203.