APA (7e ed.) Bronvermelding

Não informado. (2009). Gas International. Institution of Gas Engineers and Managers.

Chicago (17e ed.) Bronvermelding

Não informado. Gas International. Loughborough, Inglaterra: Institution of Gas Engineers and Managers, 2009.

MLA (8e ed.) Bronvermelding

Não informado. Gas International. Institution of Gas Engineers and Managers, 2009.

Let op: Deze citaties zijn niet altijd 100% accuraat.