United Nations, Conference on Trade and Development. (1971). Port statistics. Selection, collection and presentation of port information and statistics. United Nations.
Citazione stile Chigago Style (17a edizione)United Nations, Conference on Trade and Development. Port Statistics. Selection, Collection and Presentation of Port Information and Statistics. Nueva York: United Nations, 1971.
Citatione MLA (9a ed.)United Nations, Conference on Trade and Development. Port Statistics. Selection, Collection and Presentation of Port Information and Statistics. United Nations, 1971.
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