APA (7th ed.) Citation

Crump, C. G., & Jacob, E. F. (1962). The legacy of the middle ages. The Clarendon press.

Chicago Style (17th ed.) Citation

Crump, Charles G., and E. F. Jacob. The Legacy of the Middle Ages. Oxford: The Clarendon press, 1962.

MLA (9th ed.) Citation

Crump, Charles G., and E. F. Jacob. The Legacy of the Middle Ages. The Clarendon press, 1962.