APA ציטוט

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

Chicago Style (17th ed.) Citation

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.

ציטוט MLA

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