Cita APA (7a ed.)

Waring, S. M., & Herlihy, C. (2015). Are We Alone in the Universe?

Cita Chicago Style (17a ed.)

Waring, Scott M., y Christine Herlihy. Are We Alone in the Universe? 2015.

Cita MLA (9a ed.)

Waring, Scott M., y Christine Herlihy. Are We Alone in the Universe? 2015.