References
- Beuermann, I (2002). "Metropolitan Ambitions and Politics: Kells-Mellifont and Man & the Isles". Peritia . 16: 419–434. doi:10.1484/J.Peri.3.497. ISSN 0332-1592.
- Beuermann, I (2012). The Norwegian Attack on Iona in 1209–10: The Last Viking Raid?. Iona Research Conference, April 10th to 12th 2012. pp. 1–10. Archived from the original (PDF) on 5 January 2014. Retrieved 22 February 2013.
- McDonald, RA (2007). Manx Kingship in its Irish Sea Setting, 1187–1229: King Rǫgnvaldr and the Crovan Dynasty. Dublin: Four Courts Press. ISBN 978-1-84682-047-2.
- Woolf, A (2003). "The Diocese of the Sudreyar". In Imsen, S (ed.). Ecclesia Nidrosiensis, 1153–1537: Søkelys på Nidaroskirkens og Nidarosprovinsens Historie. Tapir Akademisk Forlag. pp. 171–181. ISBN 978-82-519-1873-2 – via Academia.edu.
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