Não informado. (1952). International Trade. General Agreement on Tariffs and Trade.
Lua i Stíl Chicago (17ú heag.)Não informado. International Trade. Geneva, Suíça: General Agreement on Tariffs and Trade, 1952.
Lua MLA (8ú heag.)Não informado. International Trade. General Agreement on Tariffs and Trade, 1952.
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