Epistolae selectae / curante sac. Nicolao Turchi .. - Gregorius PP. I, Magnus, s., c. 540-604. (OLS)http://pul/name/1072; Gregorius PP. I, Magnus, s., c. 540-604. Regula pastoralis. (OLS)http://pul/name/11309 (ex off. typ. Forzani, 1907)
Sancti Gregorii Papae regulae pastoralis liber.