GORDON, George; MITCHELL, Arthur. Notice of Incised Sculpturings on the Steatite Rock at Feideland, the Extreme North of the Mainland of Shetland, and of a Cluster of Ruined Structures Styled Picts’ Houses, on the Kaim of Isbister, Shetland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 12, p. 202–206, 1877. DOI: 10.9750/PSAS.012.202.206. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/5810. Acesso em: 2 may. 2024.