Dyfyniad APA

ebrary, Inc, & Helm, D. (2005). Climate-change policy. Oxford University Press.

Dyfyniad Arddull Chicago

ebrary, Inc, and Dieter Helm. Climate-change Policy. Oxford: Oxford University Press, 2005.

Dyfyniad MLA

ebrary, Inc, and Dieter Helm. Climate-change Policy. Oxford University Press, 2005.

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