Cita APA (7a ed.)
(2005). National Geographic: Almanac of geography. National Geographic Society.
Cita Chicago Style (17a ed.)
National Geographic: Almanac of Geography. Washington, D.C: National Geographic Society, 2005.
Cita MLA (9a ed.)
National Geographic: Almanac of Geography. National Geographic Society, 2005.
Precaución: Estas citas no son 100% exactas.