United Nations Environment Programme. Division of Early Warning and Assessment. (2006). Geo year book 2006: An overview of our changing environment. UNEP Division of Early Warning and Assessment.
Lua i Stíl Chicago (17ú heag.)United Nations Environment Programme. Division of Early Warning and Assessment. Geo Year Book 2006: An Overview of Our Changing Environment. Nairobi: UNEP Division of Early Warning and Assessment, 2006.
Lua MLA (9ú heag.)United Nations Environment Programme. Division of Early Warning and Assessment. Geo Year Book 2006: An Overview of Our Changing Environment. UNEP Division of Early Warning and Assessment, 2006.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.