United States. Department of Agriculture. Economic Research Service. (1994). Agricultural resources and environmental indicators. U.S. Dept. of Agriculture, Economic Research Service.
Chicago-tyylinen lähdeviittausUnited States. Department of Agriculture. Economic Research Service. Agricultural Resources and Environmental Indicators. Washington, DC: U.S. Dept. of Agriculture, Economic Research Service, 1994.
MLA-viiteUnited States. Department of Agriculture. Economic Research Service. Agricultural Resources and Environmental Indicators. U.S. Dept. of Agriculture, Economic Research Service, 1994.
Harvard-tyylinen lähdeviittausUnited States. Department of Agriculture. Economic Research Service. 1994. Agricultural resources and environmental indicators. Washington, DC: U.S. Dept. of Agriculture, Economic Research Service.
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