Citação norma APA
(1997). 20th World Gas Conference 1997. Volume 12: Task Force TF 2. Report and Papers. Gas and Developing Countries. Le gaz et les pays en voie de développment. International Gas Union.
Citação norma Chicago
20th World Gas Conference 1997. Volume 12: Task Force TF 2. Report and Papers. Gas and Developing Countries. Le Gaz Et Les Pays En Voie De Développment. B.m.: International Gas Union, 1997.
Citação norma MLA
20th World Gas Conference 1997. Volume 12: Task Force TF 2. Report and Papers. Gas and Developing Countries. Le Gaz Et Les Pays En Voie De Développment. International Gas Union, 1997.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.