APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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