Cita APA

National Geographic Socity. Special Publication Division & Gray, W. B. (1978). Power of nature. Prepared by the Special Publication Division, National Geographic Society.

Citación estilo Chicago

National Geographic Socity. Special Publication Division and William B. Gray. Power of Nature. Washington, DC: Prepared by the Special Publication Division, National Geographic Society, 1978.

Cita MLA

National Geographic Socity. Special Publication Division and William B. Gray. Power of Nature. Prepared by the Special Publication Division, National Geographic Society, 1978.