APA (7th ed.) Citation

Runciman, S. (1951). A History of the Crusades 1: The first Crusade and the foundation of the Kingdom of Jerusalem. Penguin Books.

Chicago Style (17th ed.) Citation

Runciman, Steven. A History of the Crusades 1: The First Crusade and the Foundation of the Kingdom of Jerusalem. [S. l.]: Penguin Books, 1951.

MLA (9th ed.) Citation

Runciman, Steven. A History of the Crusades 1: The First Crusade and the Foundation of the Kingdom of Jerusalem. Penguin Books, 1951.