(1997). Petroleum Geo-Services: Annual report 1997. PGS.
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Citação norma Chicago
Petroleum Geo-Services: Annual Report 1997. Oslo: PGS, 1997.
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Citação norma MLA
Petroleum Geo-Services: Annual Report 1997. PGS, 1997.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.