Não informado. (2009). Gas International. Institution of Gas Engineers and Managers.
Chicago-Zitierstil (17. Ausg.)Não informado. Gas International. Loughborough, Inglaterra: Institution of Gas Engineers and Managers, 2009.
MLA-Zitierstil (8. Ausg.)Não informado. Gas International. Institution of Gas Engineers and Managers, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.