APA (7e ed.) Bronvermelding

Não informado. (1961). Petroleum Intelligence Weekly. Petroleum Intellegence Weekly.

Chicago (17e ed.) Bronvermelding

Não informado. Petroleum Intelligence Weekly. New York: Petroleum Intellegence Weekly, 1961.

MLA (8e ed.) Bronvermelding

Não informado. Petroleum Intelligence Weekly. Petroleum Intellegence Weekly, 1961.

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