Peters, Edward Europe, the world of the Middle Ages / E. Peters. - Englewood Cliffs, NJ : Prentice-Hall, 1977. - XV, 620 p. : maps ; 23 cm. Bibliogr. p. 587-615; Index p. 617-620 ISBN: 0-13-291898-6 Subjects--Topical Terms: History--Middle AgesCivilization, Medieval