Não informado. (1975). Agricultural Outlook. U.S. Department of Agriculture, Economic Research Service.
Citação do estilo Chicago (17ª ed.)Não informado. Agricultural Outlook. Washington: U.S. Department of Agriculture, Economic Research Service, 1975.
Citação MLA (8ª ed.)Não informado. Agricultural Outlook. U.S. Department of Agriculture, Economic Research Service, 1975.
警告：这些引文格式不一定是100％准确.