Stewart, I. S., & Lynch, J. (2007). Earth: The biography. National Geographic Society.
Cita Chicago Style (17a ed.)Stewart, Iain S., y John Lynch. Earth: The Biography. Washington, D.C.: National Geographic Society, 2007.
Cita MLA (8a ed.)Stewart, Iain S., y John Lynch. Earth: The Biography. National Geographic Society, 2007.
Precaución: Estas citas no son 100% exactas.