(1977). Quarterly bulletin of coal statistics for Europe. United Nations.
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Citação norma Chicago
Quarterly Bulletin of Coal Statistics for Europe. New York: United Nations, 1977.
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Citação norma MLA
Quarterly Bulletin of Coal Statistics for Europe. United Nations, 1977.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.