Não informado. (2021). Annual Bulletin of Transport Statistics for Europe and North America. United Nations.
Čikaški stil citiranja (17. izdanje)Não informado. Annual Bulletin of Transport Statistics for Europe and North America. New York: United Nations, 2021.
MLA način citiranja (8. izdanje)Não informado. Annual Bulletin of Transport Statistics for Europe and North America. United Nations, 2021.
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