Não informado. Milk Production. U.S. Department of Agriculture, Agricultural Marketing Service.
Chicago-referens (17:e uppl.)Não informado. Milk Production. Washington: U.S. Department of Agriculture, Agricultural Marketing Service.
MLA-referens (8:e uppl.)Não informado. Milk Production. U.S. Department of Agriculture, Agricultural Marketing Service.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.