United Nations Environment Programme. (2003). Tunza: Acting for a better world. United Nations Environment Programme.
Citazione stile Chigago Style (17a edizione)United Nations Environment Programme. Tunza: Acting for a Better World. [Nairobi, Kenya]: United Nations Environment Programme, 2003.
Citatione MLA (9a ed.)United Nations Environment Programme. Tunza: Acting for a Better World. United Nations Environment Programme, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.