Changes
* Dulles, Avery Cardinal. ''Magisterium: Teacher and Guardian of the Faith'' (2007), by leading Catholic theologian
* Hasler, August Bernard. ''How the Pope Became Infallible: Pius IX and the Politics of Persuasion'' (1980), popular history.
* Hales, E. E. Y. ''Pio Nono: A Study in European Politics and Religion in the Nineteenth Century'' (1954) [http://www.questia.com/PM.qst?a=o&d=9277182 online edition]
* O'Connor, James T. ''The Gift of Infallibility: The Official Relatio on Infallibility of Bishop Vincent Ferrer Gasser at Vatican Council I'' (2nd ed. 2008), pro. [http://www.amazon.com/Gift-Infallibility-Official-Relatio-Vincent/dp/1586171747/ref=sr_1_1?ie=UTF8&s=books&qid=1254479187&sr=1-1 excerpt and text search]
* Ott, Michael. "Pope Pius IX" in ''The Catholic Encyclopedia.'' Vol. 12. (1911) [http://www.newadvent.org/cathen/12134b.htm online]
* Powell, Mark E. ''Papal Infallibility: A Protestant Evaluation of an Ecumenical Issue'' (2009) [http://www.amazon.com/Papal-Infallibility-Protestant-Evaluation-Ecumenical/dp/0802862845/ref=sr_1_2?ie=UTF8&s=books&qid=1254481044&sr=1-2 excerpt and text search]
* Tierney, Brian. ''Origins of Papal Infallibility 1150-1350; a Study on the Concepts of Infallibility, Sovereignty and Tradition in the Middle Ages'' (1972), the dogma was invented in the Middle Ages
* Toner, Patrick. "Infallibility." in ''The Catholic Encyclopedia.'' Vol. 7. (1910) [http://www.newadvent.org/cathen/07790a.htm online]
* [http://www.questia.com/library/religion/christianity/catholicism/papal-infallibility.jsp online books and articles from [[Questia]]]
== References ==
