APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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