Não informado. (1949). Progressive agriculture in Arizona. University of Arizona, College of Agriculture.
Chicago (17e ed.) BronvermeldingNão informado. Progressive Agriculture in Arizona. Tucson, Ariz: University of Arizona, College of Agriculture, 1949.
MLA (8e ed.) BronvermeldingNão informado. Progressive Agriculture in Arizona. University of Arizona, College of Agriculture, 1949.
Let op: Deze citaties zijn niet altijd 100% accuraat.