Wagner & Konstam 2012, p. 14: states the Northern Pictish nations were still pagan while the southern Pictish kingdoms were Catholic Wagner, Paul; Konstam, Angus (2012). Pictish Warrior AD 297-841. Bloomsbury Publishing. ISBN978-1-78200-216-1. Archived from the original on 26 September 2021. Retrieved 8 June 2018.
"Stroove". Go Visit Inishowen. 2023. Retrieved 7 December 2023.
handle.net
hdl.handle.net
MacDonald, Aidan D. S. (2013) Iona and the Shrine of Columba, c.800-1200, CORA, University College Cork: Cork Open Research Archive, https://hdl.handle.net/10468/15058
Wesseling, Margaret (1988). "Structure and Image in the "Altus Prosator": Columba's Symmetrical Universe". Proceedings of the Harvard Celtic Colloquium. 8: 46–57. JSTOR20557197.
keltiskfromhet.no
Columba(PDF) (in Norwegian), NO: Keltiskfromhet, archived(PDF) from the original on 19 October 2013, retrieved 30 August 2009
Columba(PDF) (in Norwegian), NO: Keltiskfromhet, archived(PDF) from the original on 19 October 2013, retrieved 30 August 2009
Wagner & Konstam 2012, p. 14: states the Northern Pictish nations were still pagan while the southern Pictish kingdoms were Catholic Wagner, Paul; Konstam, Angus (2012). Pictish Warrior AD 297-841. Bloomsbury Publishing. ISBN978-1-78200-216-1. Archived from the original on 26 September 2021. Retrieved 8 June 2018.