Não informado. (2002). FDA Veterinarian. Food and Drug Administration, Center for Veterinary Medicine.
Lua i Stíl Chicago (17ú heag.)Não informado. FDA Veterinarian. Rockville, Md: Food and Drug Administration, Center for Veterinary Medicine, 2002.
Lua MLA (8ú heag.)Não informado. FDA Veterinarian. Food and Drug Administration, Center for Veterinary Medicine, 2002.
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