Celtic Monasticism: History and Spirituality
- Survey, with pictures, explanations, virtual tours, and links.
- http://www.faculty.de.gcsu.edu/~dvess/ids/medieval/celtic/celtic.shtml#in

Alexander Carmichael's Carmina Gadelica
- Prayers, blessings and invocations collected by the Scottish folklorist Alexander Carmichael in the Western Isles in the 19th century.
- http://www.smo.uhi.ac.uk/gaidhlig/corpus/Carmina/

How the Irish Were Saved
- Issue of Christian History focuses on the conversion of Ireland, and Celtic Christianity from the fifth to the eighth century. Short popularizing articles.
- http://www.christianitytoday.com/ch/60h/