La réforme grégorienne - Fliche, Augustin. (OLS)http://semarc/name/150 (Spicilegium Sacrum Lovaniense ; Honoré Champion, 1924)
Keywords: Chiesa - Storia - Sec. 11. (OLS)http://semarc/subject/5657; Riforma gregoriana. (OLS)http://semarc/subject/11118