Bibliography
] Benedictine Maledictions New York Cornell University Press 1993.
The Medieval Siege Woodbridge, Suffolk Boydell Press 1992.
The Medieval Machine: The Industrial Revolution Of The Middle Ages Penguin Books 1977.
Feudalism London Longmans 1964.
The Popes At Avignon 1305-1378 9ᵉ éd. London Thomas Nelson & Sons Ltd 1963.
The Merchant Of Prato London Reprint Society 1957.
An Outline Of European Architecture Harmondsworth Pelican Books 1951.
