Helm, D. (2005). Climate-Change Policy: Introduction. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Helm, D. Climate-Change Policy: Introduction. Oxford University Press, 2005.
Lua MLA (9ú heag.)Helm, D. Climate-Change Policy: Introduction. Oxford University Press, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.