APA (7th ed.) Citation

Powicke, F. M., & Clark, G. N. S. (1953). The Thirteenth century, 1216-1307. Clrendon Press.

Chicago Style (17th ed.) Citation

Powicke, F. M., and G. N. Sir Clark. The Thirteenth Century, 1216-1307. Oxford: Clrendon Press, 1953.

MLA (9th ed.) Citation

Powicke, F. M., and G. N. Sir Clark. The Thirteenth Century, 1216-1307. Clrendon Press, 1953.

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