Lindisfarne Gospels: Description, images and links to book and video on the 7th century masterpiece of the Gospels, created in the Celtic style at Lindisfarne in honor of St. Cuthbert.
Rule of St. Columba: The Monastic Rule ascribed to St. Columba.
The Celtic Christianity e-Library: Documents supporting the MA in Celtic Studies at Lampeter University, including hagiographic and historical material in English.