Hutcheson, Alexander. “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 (November 30, 1906): 352–355. Accessed April 30, 2024. https://journals.socantscot.org/index.php/psas/article/view/7064.