APA (7e ed.) Bronvermelding

Não informado. (1968). Petroleum Review. Institute of Petroleum.

Chicago (17e ed.) Bronvermelding

Não informado. Petroleum Review. London: Institute of Petroleum, 1968.

MLA (8e ed.) Bronvermelding

Não informado. Petroleum Review. Institute of Petroleum, 1968.

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