Literatuur
- Zarnecki, George & Janet Holt & Tristan Holland (red.), English Romanesque Art 1066-1200; Hayward Gallery, London 5 April - 8 July 1984, tentoonstellingscatalogus. London (Arts Council of Great Britain & Weidenfeld and Nicolson), 1984. [416 blz. ISBN 0.7287.0386.6]. Hierin "Seals": blz. 299-319.