APA aipamena

Helm, D. (2005). Climate-Change Policy: Introduction. Oxford University Press.

Chicago Style aipamena

Helm, D. Climate-Change Policy: Introduction. Oxford University Press, 2005.

MLA aipamena

Helm, D. Climate-Change Policy: Introduction. Oxford University Press, 2005.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.