Goudie, G. 1885. Notice of Unpublished Rentals of the Ancient Lordship of Shetland, and of the Earldom and Bishopric of Orkney. Proceedings of the Society of Antiquaries of Scotland. 19, (Nov. 1885), 213–246. DOI:https://doi.org/10.9750/PSAS.019.213.246.