APA (7th ed.) Citation

Runciman, S. (1965). A history of the Crusades. Penguin.

Chicago Style (17th ed.) Citation

Runciman, Steven. A History of the Crusades. Harmondsworth: Penguin, 1965.

MLA (8th ed.) Citation

Runciman, Steven. A History of the Crusades. Penguin, 1965.

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