Callander, J. G. (1910) “Notice of (1) A Seventeenth-Century Sun-dial from Wigtownshire; and (2) a Stele, discovered in Galatia, Asia Minor, decorated with a design resembling the Mirror and Comb Symbols found in Scotland”, Proceedings of the Society of Antiquaries of Scotland, 44, pp. 169–185. doi: 10.9750/PSAS.044.169.185.