Cita APA (7th ed.)

Levorsen, A. I. (1954). Geology of petroleum. Freeman.

Cita Chicago (17th ed.)

Levorsen, A. I. Geology of Petroleum. San Fran.: Freeman, 1954.

Cita MLA (8th ed.)

Levorsen, A. I. Geology of Petroleum. Freeman, 1954.