United Nations. Conference on Trade and Development. Secretariat & United Nations. Conference on Trade and Development. Special Committee on Prefernces. (1974). Operation and effects of the genaralized system of preference: Selected studies submitted to the fifth session of the Special Committee on Preferences, Geneva, 3-13 April, 1973. United Nations.
芝加哥风格引文United Nations. Conference on Trade and Development. Secretariat 与 United Nations. Conference on Trade and Development. Special Committee on Prefernces. Operation and Effects of the Genaralized System of Preference: Selected Studies Submitted to the Fifth Session of the Special Committee on Preferences, Geneva, 3-13 April, 1973. New York: United Nations, 1974.
MLA引文United Nations. Conference on Trade and Development. Secretariat 与 United Nations. Conference on Trade and Development. Special Committee on Prefernces. Operation and Effects of the Genaralized System of Preference: Selected Studies Submitted to the Fifth Session of the Special Committee on Preferences, Geneva, 3-13 April, 1973. United Nations, 1974.