Não informado. (1949). Annual Bulletin of Transport Statistics for Europe. United Nations, Economic Commission for Europe.
Cita Chicago Style (17a ed.)Não informado. Annual Bulletin of Transport Statistics for Europe. Geneve, Suíça: United Nations, Economic Commission for Europe, 1949.
Cita MLA (8a ed.)Não informado. Annual Bulletin of Transport Statistics for Europe. United Nations, Economic Commission for Europe, 1949.
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