Dales, Richard C.The Intellectual Life of Western Europe in the Middle Ages, σελ. 88 - 89, BRILL, 1992
(ISBN90-04-09622-1) - summarizes recent scholarship. See also Dodwell, 32
JSTOR Review by John J. Contreni of:Opus Caroli regis contra synodum (Libri Carolini) της Ann Freeman; Paul Meyvaert, Speculum, τομ. 76, αρ. 2 (Απρίλιος 2001), σελ. 453-455.