ISBN 1-84018-376-4* Muir, Tom (2005) "Orkney in the Sagas: The Story of the Earldom of Orkney as told in the Icelandic Sagas".
ISBN 1-84018-376-4* Muir, Tom (2005) Orkney in the Sagas: The Story of the Earldom of Orkney as told in the Icelandic Sagas.