Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.