Holder-Egger, O. (ed). Agnelli qui et Andreas liber pontificalis ecclesiae Ravennatis in Waitz: Scriptores rerum Langobardicarum et Italicarum saec. VI-IX, p. 265–391. Hannover, 1878.
The eventful reign of John VI, bishop of Ravenna (726–744), from the “Liber pontificalis ecclesiae Ravennatis”.