praised conciliatory efforts undertaken between the Catholic and Russian Orthodox churches during Benedict's pontificate. Some Catholics have called for Benedict's recognition as a Doctor of the Church, with Cardinal Gerhard Müller describing him as a "true doctor of the Church for today." See also Cardinals created by Benedict XVI Papal regalia and insignia – papal attire Three Secrets of Fátima – document on the release of the Third Secret of Fátima References Further reading Literature about Benedict Allen, John L.: Cardinal Ratzinger: the Vatican's enforcer of the faith. – New York: Continuum, 2000. Cavadini, John C. Explorations in the Theology of Benedict XVI. Notre Dame: University of Notre Dame Press, 2012. Benedetti, Amedeo: Il linguaggio di Benedetto XVI, al secolo Joseph Ratzinger. – Genova, Erga, 2012 Herrmann, Horst: Benedikt XVI. Der neue Papst aus Deutschland. – Berlin 2005 Nichols OP, Aidan: The Theology of Joseph Ratzinger: An Introductory Study. – Edinburgh; T&T Clark, 1988 Pater Prior Maximilian Heim: Joseph Ratzinger — Kirchliche Existenz und existenzielle Theologie unter dem Anspruch von Lumen gentium (diss.). Twomey, D. Vincent, S.V.D.: Pope Benedict XVI: The Conscience of Our Age (A Theological Portrait). – San Francisco: Ignatius Press, 2007 Wagner, Karl: Kardinal Ratzinger: der Erzbischof in München und Freising in Wort und Bild. – München: Pfeiffer, 1977 Bibliography Biographies Peter Seewald: Benedict XVI: A Life, in two volumes: Volume One: Youth in Nazi Germany to the Second Vatican Council 1927–1965, Volume Two: Professor and Prefect to Pope and Pope Emeritus, 1966 – The Present, translated from the German by Dinah Livingstone, London: Bloomsbury, 2020. Joseph Ratzinger (= Benedikt XVI. – autobiographical): Aus meinem Leben. (1927–1977). Stuttgart 1998, . Alexander Kissler: Papst im Widerspruch: Benedikt XVI. und seine Kirche 2005–2013. Pattloch 2013, . Campbell, Paul-Henri: Pope Benedikt XVI. Audio Book. Monarda Publishing House, 2012, . Pursell, Brennan, Benedict of Bavaria: An Intimate Portrait of the Pope and His Homeland (Circle Press, 2008). . Allen, John L. The Rise of Benedict XVI: The Inside Story of How the Pope Was Elected and Where He Will Take the Catholic Church. NY: Doubleday, 2005. . Allen, John L. Pope Benedict XVI: A Biography of Joseph Ratzinger. New York: Continuum International Publishing Group, 2005. . This is a reprint of Allen's 2000 book Cardinal Ratzinger: the Vatican's Enforcer of the Faith. Bardazzi, Marco. In the Vineyard of the Lord: The Life, Faith, and Teachings of Joseph Ratzinger, Pope Benedict XVI.