Papa Piu XI

Y Pope Piu XI (Latin: Pius PP. XI; Italian: Pio XI; Mayu 31 1857 – Pebreru 10 1939), mibait Ambrogio Damiano Achille Ratti, menungkulan bilang Papa manibat Pebreru 6 1922, at metung a sovereign ning Vatican Lakanbalen manibat 1929 anggang king kamatayan inyang  Pebreru 10 1939.

Lawen ya rin 

 List of encyclicals of Pope Pius XI

Dalerayan

Penibatan 
 Confalonieri, Carlo. PIO XI - Visto Da Vicino. 1957. Translated by: Regis N. Barwig. PIUS XI - A Close Up. 1975. Altadena, California: The Benzinger Sisters Press.
  
  
 Morgan, Thomas B. A Reporter At The Papal Court - A Narrative of the Reign of Pope Pius XI. 1937. New York: Longmans, Green and Co.

Suglung Palual 

 Vatican Website for Pope Pius XI
 Catholic Forum Biography
 Vatican Museum Biography
 Portion of an Italian documentary on Pope Pius XI's missing encyclical (subtitled)
  - YouTube footage of Pope Pius XI speaking (in Italian)
 Pope Benedict XVI opens the Archives for the pontificate (1922-1939) of Pope Pius XI  - VATICAN CITY, July 2, 2006 "...researchers will be able to consult all the documents of the period kept in the different series of archives of the Holy See, primarily in the Vatican Secret Archives and the Archive of the Second Section of the Secretariat of State...." 

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