Literatuur
- Crook, John, The Architectural Setting of the Cult of Saints in the Early Christian West, c. 300-1200. Deel in de serie 'Oxford Historical Monographs'. Oxford (Clarendon Press), 2000. [334 blz. ISBN 0.19.820794.8]. Hierin: blz. 187 ("Th translation of the document is important. The sense turns on the preposition supra, which in my view indicates not 'on' or 'upon', but 'above' in the liturgical sense: i.e. to the east". Deze interpretatie wordt verder toegelicht)