APA-referens (7:e uppl.)

Bryan, C. D. B. (1994). The national geographic society: 100 years of adventure and discovery. Abradale Press.

Chicago-referens (17:e uppl.)

Bryan, C. D. B. The National Geographic Society: 100 Years of Adventure and Discovery. New York: Abradale Press, 1994.

MLA-referens (9:e uppl.)

Bryan, C. D. B. The National Geographic Society: 100 Years of Adventure and Discovery. Abradale Press, 1994.