Studies on Celtic languages before the year 1000

Book of Llandaf As a Historical Source

Irish influence on medieval Welsh literature

Ancient Celtic Placenames in Europe and Asia Minor

Religion and Literature in Western England, 600800 (Cambridge Studies in Anglo-Saxon England)

The Celtic Inscriptions of Britain

Religion and literature in western England, 600-800

Medieval Welsh `Englynion y Beddau'

The iron house in Ireland

Buchedd Beuno

Rhai addasiadau Cymraeg Canol o Sieffre o Fynwy