Não informado. (2008). Journal of Swine Health and Production. American Association of Swine Veterinarians.
Chicago-referens (17:e uppl.)Não informado. Journal of Swine Health and Production. Perry, Iowa: American Association of Swine Veterinarians, 2008.
MLA-referens (8:e uppl.)Não informado. Journal of Swine Health and Production. American Association of Swine Veterinarians, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.