| Loveridge, A., & Williams, E. E. (1957). Revision of the african tortoises and turtles of the suborder cryptodira. Bull. Mus. Comp. Zool. Harvard, 115, 163–557. |
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| Added by: Admin 25 Aug 2008 20:41:52 UTC |
Pop. 3%
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| Williams, E. E. (1960). Two species of tortoises in northern south america. Breviora, 120, 1–13. |
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| Added by: Admin 25 Aug 2008 21:59:24 UTC |
Pop. 2.75%
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| Williams, E. E. (1954). A key and description of the genus podocnemis (sensu boulenger), (testudines, pelomedusidae). Bull. Mus. Comp. Zool. Cambridge, 111(8), Mass. |
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| Added by: Admin 25 Aug 2008 21:59:23 UTC |
Pop. 3%
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| Williams, E. E. (1958). Rediscovery of the australian chelid genus pseudemydura siebenrock (chelidae, testudines). Breviora, 84, 1–11. |
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| Added by: Admin 25 Aug 2008 21:59:23 UTC |
Pop. 3%
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