LAING, David. A Decreit of Spulzie, granted by the Lords of Council to William Bruce of Symbister in Zetland, against Patrick Earl of Orkney, 4th October 1609. Archaeologia Scotica, [S. l.], v. 4, p. 385–398, 1858. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/260. Acesso em: 25 apr. 2024.