APA (7e ed.) Bronvermelding

Não informado. (1919). American Gas Association monthly. American Gas Association.

Chicago (17e ed.) Bronvermelding

Não informado. American Gas Association Monthly. Arlington, Va: American Gas Association, 1919.

MLA (8e ed.) Bronvermelding

Não informado. American Gas Association Monthly. American Gas Association, 1919.

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