F. Petruccelli della Gattina, Histoire diplomatique des conclaves Volume I (Paris: 1864), 236-252.
William Cornwallis Cartwright, On the Constitution of Papal Conclaves (Edinburgh 1878) 125-129.
Ferdinand Gregorovius, The History of Rome in the Middle Ages (translated from the fourth German edition by A. Hamilton) Volume 7 part 1 [Book XIII, Chapter 1] (London 1900) 22-26.
Ludwig Pastor, History of the Popes (tr. R.F. Kerr) Volume I (St. Louis 1906).
Peter Partner, The Papal State under Martin V (London 1958).