APA (7th ed.) Citation

Runciman, S. (1951). A history of the crusades. Cambridge at the University Press.

Chicago Style (17th ed.) Citation

Runciman, Steven. A History of the Crusades. Londres: Cambridge at the University Press, 1951.

MLA (9th ed.) Citation

Runciman, Steven. A History of the Crusades. Cambridge at the University Press, 1951.