APA (7e ed.) Bronvermelding

Não informado. (1961). Petroleum Abstracts. University of Tulsa, Information Services Division.

Chicago (17e ed.) Bronvermelding

Não informado. Petroleum Abstracts. Tulsa, Okla: University of Tulsa, Information Services Division, 1961.

MLA (8e ed.) Bronvermelding

Não informado. Petroleum Abstracts. University of Tulsa, Information Services Division, 1961.

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