Cita APA (7th ed.)
United Nations Environment Programme. (2007). Global environment outlook: Environment for development, GEO 4. United Nations Environment Programme.
Cita Chicago (17th ed.)
United Nations Environment Programme. Global Environment Outlook: Environment for Development, GEO 4. Nairobi, Kenya: United Nations Environment Programme, 2007.
Cita MLA (9th ed.)
United Nations Environment Programme. Global Environment Outlook: Environment for Development, GEO 4. United Nations Environment Programme, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.