Citação norma APA
(1997). 20th World Gas Conference 1997. Volume 11: Task Force TF 1. Report and Papers. Gas and the Environment. Gaz et environment. International Gas Union.
Citação norma Chicago
20th World Gas Conference 1997. Volume 11: Task Force TF 1. Report and Papers. Gas and the Environment. Gaz Et Environment. B.m.: International Gas Union, 1997.
Citação norma MLA
20th World Gas Conference 1997. Volume 11: Task Force TF 1. Report and Papers. Gas and the Environment. Gaz Et Environment. International Gas Union, 1997.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.