APA (7e ed.) Bronvermelding

Não informado. (2001). Western oil and refining. Palmer Publications.

Chicago (17e ed.) Bronvermelding

Não informado. Western Oil and Refining. Los Angeles, Calif: Palmer Publications, 2001.

MLA (8e ed.) Bronvermelding

Não informado. Western Oil and Refining. Palmer Publications, 2001.

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