(1997). 20th World Gas Conference 1997. International Gas Union.
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Citação norma Chicago
20th World Gas Conference 1997. B.m.: International Gas Union, 1997.
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Citação norma MLA
20th World Gas Conference 1997. International Gas Union, 1997.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.