Não informado. (2019). Statistical Yearbook. United Nations, Department of International Economic.
Čikaški stil citiranja (17. izdanje)Não informado. Statistical Yearbook. New York: United Nations, Department of International Economic, 2019.
MLA način citiranja (8. izdanje)Não informado. Statistical Yearbook. United Nations, Department of International Economic, 2019.
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