Não informado. (2002). Rural America. U.S. Department of Agriculture, Economic Research Service.
Chicago-referens (17:e uppl.)Não informado. Rural America. Washington: U.S. Department of Agriculture, Economic Research Service, 2002.
MLA-referens (8:e uppl.)Não informado. Rural America. U.S. Department of Agriculture, Economic Research Service, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.