Coles, F. “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, Vol. 39, Nov. 1905, pp. 190-18, doi:10.9750/PSAS.039.190.218.