APA (7th ed.) Zitazioa

ebrary, Inc. (1993). Agricultural crop issues and policies. National Academy Press.

Chicago Style (17th ed.) Zitazioa

ebrary, Inc. Agricultural Crop Issues and Policies. Washington, D.C.: National Academy Press, 1993.

MLA (9th ed.) Zitazioa

ebrary, Inc. Agricultural Crop Issues and Policies. National Academy Press, 1993.