Bolvig, A. R.I. Moore: The Birth of Popular Heresy. Documents of Medieval History 1. Edward Arnold Ltd., London, 1975. 166 S. H. R. Loyn and ]. Percival: The Reign of Charlemagne. Documents of Medieval History 2. Edward Arnold Ltd., London, 1975. 164 S. - Begge bøger fås Også I Paperback Udgave. ht 1977, 13.