APA (7th ed.) Citation
(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.
Chicago Style (17th ed.) Citation
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.
MLA (9th ed.) Citation
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.
Warning: These citations may not always be 100% accurate.