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Downham 2007: pp. 33–34, 39. Downham, Clare (2007), "Living on the edge: Scandinavian Dublin in the twelfth century", in Smith, Beverley Ballin; Taylor, Simon; Williams, Gareth (eds.), West over the sea: studies in Scandinavian sea-borne expansion and settlement before 1300, The Northern World: North Europe and the Baltic c. 400–1700 AD. Peoples, Economies and Cultures, vol. 31, Brill, pp. 33–52, ISBN978-90-04-15893-1, ISSN1569-1462.