Lua APA (7ú heag.)

United States. Department of Agriculture. Economic Research Service. (1994). Agricultural resources and environmental indicators. The Service.

Lua i Stíl Chicago (17ú heag.)

United States. Department of Agriculture. Economic Research Service. Agricultural Resources and Environmental Indicators. Washington, DC: The Service, 1994.

Lua MLA (9ú heag.)

United States. Department of Agriculture. Economic Research Service. Agricultural Resources and Environmental Indicators. The Service, 1994.

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