APA (7th ed.) Zitazioa

United Nations Environment Programme. (2003). Tunza: Acting for a better world. United Nations Environment Programme.

Chicago Style (17th ed.) Zitazioa

United Nations Environment Programme. Tunza: Acting for a Better World. [Nairobi, Kenya]: United Nations Environment Programme, 2003.

MLA (9th ed.) Zitazioa

United Nations Environment Programme. Tunza: Acting for a Better World. United Nations Environment Programme, 2003.