Originally Ambrogio Damiano Achille Ratti. 1857-1939
"Pius XI." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/pius-xi>.
Pius XI. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/pius-xi
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