Cita APA

National Geographic Society. (2015). Answer book: 10,001 fast facts about our world. National Geographic Society.

Citación estilo Chicago

National Geographic Society. Answer Book: 10,001 Fast Facts About Our World. Washington, D.C.: National Geographic Society, 2015.

Cita MLA

National Geographic Society. Answer Book: 10,001 Fast Facts About Our World. National Geographic Society, 2015.