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.
Style de citation Chicago (17e éd.)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.
Style de citation MLA (9e éd.)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.
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