Paton, N. 1887. Notes on Clach-na-Bratach, the Stone of the Standard, now Deposited on Loan in the Museum by Alasdair Stewart Robertson of Strowan. Proceedings of the Society of Antiquaries of Scotland. 21, (Nov. 1887), 226–236. DOI:https://doi.org/10.9750/PSAS.021.226.236.