United Nations Environment Programme. (2006). Africa environment outlook 2: Our environment, our wealth. United Nations Environment Programme.
Citazione stile Chigago Style (17a edizione)United Nations Environment Programme. Africa Environment Outlook 2: Our Environment, Our Wealth. Nairobi, Kenya: United Nations Environment Programme, 2006.
Citatione MLA (9a ed.)United Nations Environment Programme. Africa Environment Outlook 2: Our Environment, Our Wealth. United Nations Environment Programme, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.