Não informado. (2021). Annual Bulletin of Steel Statistics for Europe, America and Asia. United Nations.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Bulletin of Steel Statistics for Europe, America and Asia. New York: United Nations, 2021.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Bulletin of Steel Statistics for Europe, America and Asia. United Nations, 2021.
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