Quellen zur Geschichte des Papsttums und des römischen Katholizismus - Aland, Kurt, <1915-1994>. (OLS)http://semarc/name/80; Mirbt, Carl. (OLS)http://semarc/name/9630 (Mohr Siebeck)
Poss. solo il vol. 1.
Keywords: Papato - Storia. (OLS)http://semarc/subject/198; Cattolicesimo - Storia. (OLS)http://semarc/subject/3376