APA (7th ed.) Citation

Peterson, H., & Unger, T. V. (1964). Petróleo: Hora cero. [publisher not identified].

Chicago Style (17th ed.) Citation

Peterson, Harries-Clichy, and Tomás V. Unger. Petróleo: Hora Cero. Lima: [publisher not identified], 1964.

MLA (9th ed.) Citation

Peterson, Harries-Clichy, and Tomás V. Unger. Petróleo: Hora Cero. [publisher not identified], 1964.