Παραπομπή APA

Levorsen, A. I., & Berry, F. A. F. (2004). Geology of petroleum (2d ed.). CBS.

Παραπομπή Chicago Style

Levorsen, A. I., και Frederick A. F. Berry. Geology of Petroleum. 2d ed. New Delhi: CBS, 2004.

Παραπομπή MLA

Levorsen, A. I., και Frederick A. F. Berry. Geology of Petroleum. 2d ed. CBS, 2004.