United Nations Conference on Trade and Development & United Nations Conference on Trade and Development. Special Committee on Preferences. (1974). Operation and effects of the generalized system of preferences. United Nations.
芝加哥风格引文United Nations Conference on Trade and Development 与 United Nations Conference on Trade and Development. Special Committee on Preferences. Operation and Effects of the Generalized System of Preferences. New York: United Nations, 1974.
MLA引文United Nations Conference on Trade and Development 与 United Nations Conference on Trade and Development. Special Committee on Preferences. Operation and Effects of the Generalized System of Preferences. United Nations, 1974.
警告：这些引文格式不一定是100％准确.