Cita APA (7a ed.)

Reichenbach, H., & Reichenbach, M. (1999). The direction of time. Dover Publications.

Cita Chicago Style (17a ed.)

Reichenbach, Hans, y María Reichenbach. The Direction of Time. Mineola (New York): Dover Publications, 1999.

Cita MLA (9a ed.)

Reichenbach, Hans, y María Reichenbach. The Direction of Time. Dover Publications, 1999.