Παραπομπή APA

Levorsen, A. I. (1967). Geology of petroleum (2nd ed.). Feffer and Simons.

Παραπομπή Chicago Style

Levorsen, A. I. Geology of Petroleum. 2nd ed. Bombay: Feffer and Simons, 1967.

Παραπομπή MLA

Levorsen, A. I. Geology of Petroleum. 2nd ed. Feffer and Simons, 1967.