Order and innovation in the Middle Ages essays in honor of Joseph R. Strayer
Strayer, Joseph Reese,1904-1987.
Jordan, William Chester.
McNab, Bruce.
Ruiz, Teofilo Fabian.
Princeton Guildford Princeton University Press
1976
Includes bibliographies and index
ISBN 0-691-05231-x
Civilization, Western.
Civilization, Medieval.