Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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