APA (7th ed.) Zitazioa

USDA & Economic research service. (2001). Agri-environment polisy at the crossroads: Guideposts on a changing landscape; agricultural economic report No794.

Chicago Style (17th ed.) Zitazioa

USDA eta Economic research service. Agri-environment Polisy at the Crossroads: Guideposts on a Changing Landscape; Agricultural Economic Report No794. 2001.

MLA (9th ed.) Zitazioa

USDA eta Economic research service. Agri-environment Polisy at the Crossroads: Guideposts on a Changing Landscape; Agricultural Economic Report No794. 2001.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.