Não informado. (2002). Beef Cattle Report. University of Nebraska, Institute of Agricultural and Natural Resources.
Chicago-referens (17:e uppl.)Não informado. Beef Cattle Report. Lincoln, Neb: University of Nebraska, Institute of Agricultural and Natural Resources, 2002.
MLA-referens (8:e uppl.)Não informado. Beef Cattle Report. University of Nebraska, Institute of Agricultural and Natural Resources, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.