(1981). Annual bulletin of coal statistics for Europe 1980. United Nations.
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Citação norma Chicago
Annual Bulletin of Coal Statistics for Europe 1980. New York: United Nations, 1981.
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Citação norma MLA
Annual Bulletin of Coal Statistics for Europe 1980. United Nations, 1981.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.