Se endvidere William Muir: The Arrested Reformation (Morgan and Scott, 1912), pp. 37-43, Harold Grimm: The Reformation Era (Macmillan, 1954), p. 285, Index of Prohibited Books (Vatican Polyglot Press, 1930), pp. IX. X, Timothy Hurley: A Commentary on the Present Index Legislation (New York: Benziger Bros., 1908), p. 71, Translation of the Great Encyclical Letters of Leo XIII (New York: Benziger Bros., 1903), p. 413.