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Baillie, J. and Groombridge, B. 1996. 1996 IUCN Red List of Threatened Animals. International Union for Conservation of Nature, Gland, Switzerland. Pritchard, P.C.H. 1996. The Galápagos tortoises: nomenclatural and survival status. Chelonian Research Monographs 1:1-85. Rothschild, W. 1903. Description of a new species of gigantic land tortoise from Indefatigable Island. Novitates Zool. 10:119. |
| Citation: | Tortoise & Freshwater Turtle Specialist Group 1996. Chelonoidis nigra ssp. porteri. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 22 May 2013. |
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