Não informado. (1969). American beef producer. American National Livestock Association.
Chicago (17e ed.) BronvermeldingNão informado. American Beef Producer. Denver, Colo: American National Livestock Association, 1969.
MLA (8e ed.) BronvermeldingNão informado. American Beef Producer. American National Livestock Association, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.