The lives of the ninth-century popes (Liber Pontificalis) the ancient biographies of ten popes from A.D. 817 - 891.

MLA

Davis, Raymond. The Lives of the Ninth-century Popes (liber Pontificalis): the Ancient Biographies of Ten Popes From A.d. 817 - 891. Philadelphia: University of Pennsylvania Press, 1995.

APA

Davis, R. (1995). The lives of the ninth-century popes (Liber Pontificalis): the ancient biographies of ten popes from A.D. 817 - 891. Philadelphia: University of Pennsylvania Press.

Chicago

Davis, Raymond The Lives of the Ninth-Century Popes (liber Pontificalis): The Ancient Biographies of Ten Popes From A.D. 817 - 891. Philadelphia: University of Pennsylvania Press, 1995.