Não informado. (1949). Progressive agriculture in Arizona. University of Arizona, College of Agriculture.
Lua i Stíl Chicago (17ú heag.)Não informado. Progressive Agriculture in Arizona. Tucson, Ariz: University of Arizona, College of Agriculture, 1949.
Lua MLA (8ú heag.)Não informado. Progressive Agriculture in Arizona. University of Arizona, College of Agriculture, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.