(1980). <The> Coal situation in the ECE region in 1978 and its prospects. United Nations.
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Citação norma Chicago
<The> Coal Situation in the ECE Region in 1978 and Its Prospects. New York: United Nations, 1980.
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Citação norma MLA
<The> Coal Situation in the ECE Region in 1978 and Its Prospects. United Nations, 1980.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.