Cita APA (7th ed.)
Levorsen A. I. (1985). Geology of petroleum (2nd ed.). CBS Pub.
Cita Chicago (17th ed.)
Levorsen A. I. Geology of Petroleum. 2nd ed. New Delhi: CBS Pub, 1985.
Cita MLA (9th ed.)
Levorsen A. I. Geology of Petroleum. 2nd ed. CBS Pub, 1985.
Atenció: Aquestes cites poden no estar 100% correctes.