Hubert, Vivian; Green, Howard (1 March 2000). New History of Christianity. Continuum International Publishing Group. p. 389. ISBN 978-0-8264-1227-0. Retrieved 7 January 2012.
Jump up ^ Barker, Eileen (15 April 2010). The Centrality of Religion in Social Life. Ashgate Publishing, Ltd. p. 76. ISBN 978-1-4094-0343-2. Retrieved 7 January 2012.
Jump up ^ Wilsford, Political Leaders of Contemporary Western Europe (Greenwood Press 1995 ISBN 978-0-313-28623-0), p. 30
Jump up ^ Geoffrey K. Roberts, Patricia Hogwood,West European Politics (Manchester University Press 2003 ISBN 978-0-7190-5421-1), p. 84