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.
Citazione stile Chigago Style (17a edizione)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.
Citatione MLA (9a ed.)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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.