APA (7e ed.) Bronvermelding

Não informado. (1973). International petroleum abstracts. Institute of Petroleum.

Chicago (17e ed.) Bronvermelding

Não informado. International Petroleum Abstracts. London: Institute of Petroleum, 1973.

MLA (8e ed.) Bronvermelding

Não informado. International Petroleum Abstracts. Institute of Petroleum, 1973.

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