APA aipamena

National Geographic Society (U.S.). (1959). National geographic. National Geographic Society.

Chicago Style aipamena

National Geographic Society (U.S.). National Geographic. Washington: National Geographic Society, 1959.

MLA aipamena

National Geographic Society (U.S.). National Geographic. National Geographic Society, 1959.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.