Não informado. (2002). Beef Cattle Report. University of Nebraska, Institute of Agricultural and Natural Resources.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Beef Cattle Report. Lincoln, Neb: University of Nebraska, Institute of Agricultural and Natural Resources, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Beef Cattle Report. University of Nebraska, Institute of Agricultural and Natural Resources, 2002.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.