Não informado. (2002). Zoo vet news. American Association of Zoo Veterinarians.
Lua i Stíl Chicago (17ú heag.)Não informado. Zoo Vet News. Pennsylvania, Ind: American Association of Zoo Veterinarians, 2002.
Lua MLA (8ú heag.)Não informado. Zoo Vet News. American Association of Zoo Veterinarians, 2002.
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