United Nations Industrial Development Organization. (1977). Information sources on the iron and steel industry. United Nations.
芝加哥风格引文United Nations Industrial Development Organization. Information Sources on the Iron and Steel Industry. New York: United Nations, 1977.
MLA引文United Nations Industrial Development Organization. Information Sources on the Iron and Steel Industry. United Nations, 1977.
警告：这些引文格式不一定是100％准确.