Não informado. (1949). Progressive agriculture in Arizona. University of Arizona, College of Agriculture.
Chicago-Zitierstil (17. Ausg.)Não informado. Progressive Agriculture in Arizona. Tucson, Ariz: University of Arizona, College of Agriculture, 1949.
MLA-Zitierstil (8. Ausg.)Não informado. Progressive Agriculture in Arizona. University of Arizona, College of Agriculture, 1949.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.