APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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