APA (7th ed.) Citation

Não informado. (1985). National Geographic Research. National Geographic Society.

Chicago Style (17th ed.) Citation

Não informado. National Geographic Research. Gaithersburg, Md: National Geographic Society, 1985.

MLA (8th ed.) Citation

Não informado. National Geographic Research. National Geographic Society, 1985.

Warning: These citations may not always be 100% accurate.