[l] Einhard, Vita Caroli Magni.
[m] Chronicles of Moissiac.
[n] Marianus Scotus, Universal Chronicle from the Creation to the Year 1083.
[o] Sigebert of Gemblours, Chronique Universelle.
[p] Otto von Freysing, Chronik.
[q] Stephen de Bourbon, Chronicle.
[r] Martinus Polonus, Chronicon de Summis Pontificibus.
[s] Liutprand, Antapodosis.
Chapter III. The High Noon of the Papacy
[b] O. J. Reichel, op. cit.