Cita APA (7a ed.)

Levorsen, A. (1956). Geology of petroleum. W.H. Freeman and Company.

Cita Chicago Style (17a ed.)

Levorsen, A.I. Geology of Petroleum. San Francisco: W.H. Freeman and Company, 1956.

Cita MLA (8a ed.)

Levorsen, A.I. Geology of Petroleum. W.H. Freeman and Company, 1956.