Oscar Browning, Guelphs & Ghibellines: a short history of mediaeval Italy from 1250-1409, Methuen, 1893, Google Print, p.173-174 (public domain)
Baron John Emerich Edward Dalberg Acton Acton, Sir Adolphus William Ward, George Walter Prothero, Sir Stanley Mordaunt Leathes, Ernest Alfred Benians, The Cambridge modern history, Volume 1, University Press, 1912, Google Print, p.285 (public domain)
Sir Robert Buckley Comyn, The history of the Western empire: from its restoration by Charlemagne to the accession of Charles V., W. H. Allen, 1851, Google Print, p.176-177 (public domain)
William Henry Davenport Adams, The queen of the Adriatic: or, Venice past and present, T. Nelson, 1869, Google Print, p.126 (public domain)
Horatio Forbes Brown, Venice: an historical sketch of the republic, Putnam, 1893, Google Print, p.236 (public domain)
