APA (7e ed.) Bronvermelding

Não informado. (2017). Petroleum Engineer. Petroleum Engineer Publications.

Chicago (17e ed.) Bronvermelding

Não informado. Petroleum Engineer. Dallas, Tex: Petroleum Engineer Publications, 2017.

MLA (8e ed.) Bronvermelding

Não informado. Petroleum Engineer. Petroleum Engineer Publications, 2017.

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