Cita APA (7a ed.)

Aguilar, D. A. (2013). Alien worlds: Your guide to extraterrestrial life. National Geographic.

Cita Chicago Style (17a ed.)

Aguilar, David A. Alien Worlds: Your Guide to Extraterrestrial Life. Washington, D.C.: National Geographic, 2013.

Cita MLA (8a ed.)

Aguilar, David A. Alien Worlds: Your Guide to Extraterrestrial Life. National Geographic, 2013.

Precaución: Estas citas no son 100% exactas.