Hutcheson, A. 1906. Notice of a Jug of Peculiar Form found at Forfar, with an Additional Note on the Occurrence of Earthenware Jugs or Jars built into the Walls of Dwelling-houses in Scotland. Proceedings of the Society of Antiquaries of Scotland. 40, (Nov. 1906), 352–355. DOI:https://doi.org/10.9750/PSAS.040.352.355.