Não informado. (2002). Rural America. U.S. Department of Agriculture, Economic Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Rural America. Washington: U.S. Department of Agriculture, Economic Research Service, 2002.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Rural America. U.S. Department of Agriculture, Economic Research Service, 2002.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.