Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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