Redknap, Mark, Lewis, John M.: A Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales ; vol. 1: Glamorgan, Brecknockshire, Monmouthshire, Radnorshire and geographically contigouous of Herfordshire and Shropshire, Cardiff 2008.
Redknap, Mark, Lewis, John M.: A Corpus of Early Medieval Inscribed Stones and Stone Sculpture in Wales ; vol. 1: Glamorgan, Brecknockshire, Monmouthshire, Radnorshire and geographically contigouous of Herfordshire and Shropshire, Cardiff 2008.