APA (7th ed.) Zitazioa
United Nations Environment Programme & United Nations Foundation. (2004). Natural allies: UNEP and civil society. United Nations Environment Programme.
Chicago Style (17th ed.) Zitazioa
United Nations Environment Programme eta United Nations Foundation. Natural Allies: UNEP and Civil Society. Nairobi, Kenya: United Nations Environment Programme, 2004.
MLA (9th ed.) Zitazioa
United Nations Environment Programme eta United Nations Foundation. Natural Allies: UNEP and Civil Society. United Nations Environment Programme, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.