APA (7th ed.) Zitazioa

Bryan, C. (2001). The national geographic society: 100 years of adveenture and discovery. Harry N. Abrams.

Chicago Style (17th ed.) Zitazioa

Bryan, C.D.B. The National Geographic Society: 100 Years of Adveenture and Discovery. New York: Harry N. Abrams, 2001.

MLA (9th ed.) Zitazioa

Bryan, C.D.B. The National Geographic Society: 100 Years of Adveenture and Discovery. Harry N. Abrams, 2001.