United Nations Industrial Development Organization. (1977). Information sources on the iron and steel industry. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations Industrial Development Organization. Information Sources on the Iron and Steel Industry. New York: United Nations, 1977.
Citatione MLA (9a ed.)United Nations Industrial Development Organization. Information Sources on the Iron and Steel Industry. United Nations, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.