Citação norma APA

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

Citação norma 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.

Citação norma MLA

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

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.