APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.