References for Pall I. Thorfinnsson Jarl, Earl of Orkney * of Caithness

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Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 106. Marburg, 1984
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966