См. Courtney M. Booker, Past Convictions: The Penance of Louis the Pious and the Decline of the Carolingians (Philadelphia: University of Pennsylvania Press, 2009); Mayke de Jong, The Penitential State: Authority and Atonement in the Age of Louis the Pious, 814–840 (Cambridge, UK: Cambridge University Press, 2009); и др.
