Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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