APA (7e ed.) Bronvermelding

Não informado. (1971). Pacific oil world. Petroleum Publishers.

Chicago (17e ed.) Bronvermelding

Não informado. Pacific Oil World. Los Angeles, Calif: Petroleum Publishers, 1971.

MLA (8e ed.) Bronvermelding

Não informado. Pacific Oil World. Petroleum Publishers, 1971.

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