Abulafia, David. The Two Italies: Economic relations between the Norman Kingdom of Sicily and the northern communes / David Abulafia. - Cambridge : Cambridge University Press, 1977. - 310p - Cambridge studies in medieval life & thought, Third series. . Vol. 9 ISBN: 978-0-521-02306-1 Lb.40.00 Standard No.: 10217 [old SOUL v1.0 record id] Subjects--Topical Terms: Italy,Northern - Commerce - Sicily - History Dewey Class. No.: 382.094510458 / Ab94t