United Nations Conference on Trade and Development. (1969). Rules of origin in the general scheme of preferences in favour of developing countries. United Nations.
芝加哥风格引文United Nations Conference on Trade and Development. Rules of Origin in the General Scheme of Preferences in Favour of Developing Countries. N.Y.: United Nations, 1969.
MLA引文United Nations Conference on Trade and Development. Rules of Origin in the General Scheme of Preferences in Favour of Developing Countries. United Nations, 1969.
警告：这些引文格式不一定是100％准确.