Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.