Turtle Taxonomy Working Group [Rhodin, A.G.J., Iverson, J.B., Bour, R. Fritz, U., Georges, A., Shaffer, H.B., and van Dijk, P.P.]. 2017. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status (8th Ed.). In: Rhodin, A.G.J., Iverson, J.B., van Dijk, P.P., Saumure, R.A., Buhlmann, K.A., Pritchard, P.C.H., and Mittermeier, R.A. (Eds.). Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group. Chelonian Research Monographs 7:1–292. doi:10.3854/crm.7.checklist.atlas.v8.2017. (Downloaded on 08 March 2018)
Cayot, L.J., Gibbs, J.P., Tapia, W. & Caccone, A. 2017. Chelonoidis duncanensis. The IUCN Red List of Threatened Species 2017: e.T9021A3149054. doi:10.2305/IUCN.UK.2017-3.RLTS.T9021A3149054.en. Downloaded on 09 March 2018.
Tortoise & Freshwater Turtle Specialist Group. 2016. Chelonoidis vicina. The IUCN Red List of Threatened Species 2016: e.T9028A97238881. doi:10.2305/IUCN.UK.2016-1.RLTS.T9028A97238881.en. Downloaded on 09 March 2018.
UNEP (2018). Chelonoidis niger. The Species+ Website. Nairobi, Kenya. Compiled by UNEP-WCMC, Cambridge, UK. Available at: www.speciesplus.net. (Accessed 08/03/2018)
