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———. The Kingdom of the Scots: Government, Church and Society from the Eleventh to the Fourteenth Century. 2nd ed, Edinburgh University Press, 2003.
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———. Sea Change: Orkney and Northern Europe in the Later Iron Age AD 300-800. Pinkfoot, 2003, http://content.talisaspire.com/glasgow/bundles/568cd9c5e7ebb60218000016.
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