Não informado. (2002). Cattle Practice. British Cattle Veterinary Association.
Chicago-referens (17:e uppl.)Não informado. Cattle Practice. Gloucestershire, Inglaterra: British Cattle Veterinary Association, 2002.
MLA-referens (8:e uppl.)Não informado. Cattle Practice. British Cattle Veterinary Association, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.