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. (1877). Proceedings of the Society of Antiquaries of Scotland, 12, 202-206. https://doi.org/10.9750/PSAS.012.202.206