Pope Gregory VII (Simple English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pope Gregory VII" in Simple English language version.

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2books.google.com

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books.google.com

Society for the Diffusion of Useful Knowledge. (1838). "Gregory VII," Penny cyclopaedia, Vol. 11, pp. 444-446.
Douglas, J. James Dixon. (1992). "Gregory VII," Who's Who in Christianity, p. 288.

newadvent.org

"List of Popes," Catholic Encyclopedia (2009); retrieved 2011-12-1.
"Pope St. Gregory VII," Catholic Encyclopedia; retrieved 2011-12-1.