Não informado. (1949). Progressive agriculture in Arizona. University of Arizona, College of Agriculture.
Chicago-viite (17. p.)Não informado. Progressive Agriculture in Arizona. Tucson, Ariz: University of Arizona, College of Agriculture, 1949.
MLA-viite (8. p.)Não informado. Progressive Agriculture in Arizona. University of Arizona, College of Agriculture, 1949.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.