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Rujukan WikiPedia: Paus_Pius_XI http://books.google.com/books?id=gxEONS0FFlsC&pg=P... http://query.nytimes.com/gst/abstract.html?res=F30... http://www.nytimes.com/learning/general/onthisday/... http://embryo.asu.edu/about/index.php http://embryo.asu.edu/view/embryo:124787 http://www2.fiu.edu/~mirandas/bios-r.htm#Ratti http://www2.fiu.edu/~mirandas/cardinals.htm http://www.catholic-hierarchy.org/ http://www.catholic-hierarchy.org/bishop/bratti.ht... http://www.newadvent.org/cathen/12272b.htm
