Coles, Frederick 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 (November):190-218. https://doi.org/10.9750/PSAS.039.190.218.