"The Lives of Ninth-Century Popes (Liber Pontificalis). The Ancient Biographies of Ten Popes from A. D. 817-891", transl. with an introd. by Raymond Davis, Liverpool 1995 : [recenzja]

Quaestiones Medii Aevi Novae, Tom 2 (1997) s. 215
János M. Bak , Raymond Davis (aut. dzieła rec.)