United Nations Environment Programme & UNEP. Global Environment Outlook 3: Past, present and future perspectives. GEO-3: past, present and future perspectives.
Chicago-referens (17:e uppl.)United Nations Environment Programme och UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives. UNEP. EARTHSCAN.
MLA-referens (9:e uppl.)United Nations Environment Programme och UNEP. Global Environment Outlook 3: Past, Present and Future Perspectives. GEO-3: Past, Present and Future Perspectives.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.