For general works dealing with the papacy, see bibliography under Roman Catholic Church. See also J. B. Bury, A History of the Papacy in the Nineteenth Century (1930, repr. 1964); Geoffrey Barraclough, The Medieval Papacy (1968); Peter Nichols, The Politics of the Vatican (1968); Walter Ullmann, The Growth of Papal Government in the Middle Ages (3d ed. 1970); Ludwig von Hertling, Communio: Church and Papacy in Early Christianity (tr. 1972); J. N. D. Kelly, Oxford Dictionary of Popes (1986); B. Schimmelpfennig, The Papacy (tr. by James Sievert, 1992); E. Duffy, Saints & Sinners (1997); R. P. McBrien, Lives of the Popes (1997); P. G. Maxwell-Stuart, Chronicle of the Popes (1997); J. J. Norwich, Absolute Monarchs: A History of the Papacy (2011); E. Duffy, Ten Popes Who Shook the World (2011).