Gow, James MacKintosh. “Notes Near St Fillans : Cup-Marked Stones, Old Burying Grounds at Kindrochet and Drumnakill, Curing Stone or Charm, and Notice of a Flint Knife Found on the Farm of North Pet, Tarland, Aberdeenshire”. Proceedings of the Society of Antiquaries of Scotland, vol. 22, Nov. 1888, pp. 23-26, doi:10.9750/PSAS.022.23.26.