“Excavation of a Chambered Cairn at Ham, Caithness, and of a Hut-Circle and Two Earth-Houses at Freswick Links, Caithness: With a Note on a Winged Horse carved on one of the Lintels in the Earth-House at Crichton Mains, Midlothian” (1925) Proceedings of the Society of Antiquaries of Scotland, 59, pp. 85–95. doi:10.9750/PSAS.059.85.95.