Coles, F. R. (1905) “Record of (I) the Excavation of two Stone Circles in Kincardineshire: (1) in Garrol Wood, Durris; (2) in Glassel Wood, Banchory-Ternan; and (II) Report on Stone Circles in Aberdeenshire, with measured Plans and Drawings; obtained under the Gunning Fellows”, Proceedings of the Society of Antiquaries of Scotland, 39, pp. 190–218. doi: 10.9750/PSAS.039.190.218.