Brook, Alexander J S. “Notes on a Brass Table Clock Bequeathed to the Society of Antiquaries of Scotland by the Late Hugh J Rollo, W.S., and a Silver-Cased Table Clock Bequeathed to the Society by the Late Lady Jane Dundas”. Proceedings of the Society of Antiquaries of Scotland, vol. 40, Nov. 1906, pp. 266-7, doi:10.9750/PSAS.040.266.276.