Edwards, A. J. H.; Bryce, T. H. Excavation of Graves at Ackergill and of an Earth-House at Freswick Links, Caithness, and a Description of the Discovery of a Viking Grave at Reay, Caithness: With a Preliminary Note on the Skeletal Remains from the Various Graves. PSAS 1927, 61, 196-209.