Jabarkan . dari Kerajaan Pulau-Pulau

Sellar, William David Hamilton Hebridean sea kings: The successors of Somerled, 1164–1316 in Cowan, Edward J. and McDonald, Russell Andrew (eds) (2000) Alba: Celtic Scotland in the middle ages. Tuckwell Press.

Thomson, William P. L. (2008) The New History of Orkney. Edinburgh. Birlinn.

Sharples, Niall and Smith, Rachel "Norse settlement in the Western Isles" in Woolf, Alex (ed.) (2009)

Sheehan, John and Ó Corráin, Donnchadh (2010) The Viking Age: Ireland and the West. Proceedings of the Fifteenth Viking Congress. Dublin. Four Courts Press.

Woolf, Alex (2005) "The origins and ancestry of Somerled: Gofraid mac Fergusa and ‘The Annals of the Four Masters’". Mediaeval Scandinavia.15 pp. 199–213.

Woolf, Alex "The Age of the Sea-Kings: 900–1300" in Omand, Donald (ed) (2006) The Argyll Book. Edinburgh. Birlinn.

Woolf, Alex (2007) From Pictland to Alba, 789–1070. The New Edinburgh History of Scotland. Edinburgh. Edinburgh University Press.

Woolf, Alex (ed.) (2009) Scandinavian Scotland – Twenty Years After. St Andrews. St Andrews University Press.