Não informado. (1975). Agricultural Outlook. U.S. Department of Agriculture, Economic Research Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Outlook. Washington: U.S. Department of Agriculture, Economic Research Service, 1975.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Outlook. U.S. Department of Agriculture, Economic Research Service, 1975.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.