MacDonagh, Thomas, The Catholic encyclopedia: an international work of reference on the constitution, doctrine, discipline, and history of the Catholic church, volumo 17, paĝo 477, The Catholic Encyclopedia Inc., 1922 http://books.google.com/books?id=r20sAAAAIAAJ&pg=PA477#v=onepage&q&f=false Konsultita la 9a Nov 2010.