Não informado. (2008). Journal of Swine Health and Production. American Association of Swine Veterinarians.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Swine Health and Production. Perry, Iowa: American Association of Swine Veterinarians, 2008.
Lua MLA (8ú heag.)Não informado. Journal of Swine Health and Production. American Association of Swine Veterinarians, 2008.
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