Não informado. (1962). Farm index. U.S. Department of Agriculture, Economic Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Farm Index. Washington: U.S. Department of Agriculture, Economic Research Service, 1962.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Farm Index. U.S. Department of Agriculture, Economic Research Service, 1962.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.