APA (7th ed.) Citation

National Geographic Society (U.S.) & Setton, K. M. (1969). The Age of chivalry. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.) and Kenneth M. Setton. The Age of Chivalry. [Washington, D.C.]: National Geographic Society, 1969.

MLA (9th ed.) Citation

National Geographic Society (U.S.) and Kenneth M. Setton. The Age of Chivalry. National Geographic Society, 1969.

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