APA (7e ed.) Bronvermelding

Não informado. (2020). Petroleum Age. Petroleum Age Publishing Company.

Chicago (17e ed.) Bronvermelding

Não informado. Petroleum Age. Chicago, Ill: Petroleum Age Publishing Company, 2020.

MLA (8e ed.) Bronvermelding

Não informado. Petroleum Age. Petroleum Age Publishing Company, 2020.

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