Anderson, J. Notice of the Excavation of the Brochs of Yarhouse, Brounaben, Bowermadden, Old Stirkoke, and Dunbeath, in Caithness, With Remarks on the Period of the Brochs; and an Aplpendix, Containing a Collected List of the Brochs of Scotland, and Early Notices of Many of them.And an Appendix Containing a Collected List of the Brochs of Scotland, and Early Notices of Many of Them. arch-scot 1891, 5, 131-198.