Hutcheson, Alexander. “Notice of the Discovery of Earthenware Jars in the Walls of Dwelling-Houses in Dundee, With Some Instances of the Use of Jars in Architecture”. Proceedings of the Society of Antiquaries of Scotland 17 (November 30, 1883): 426-432. Accessed December 5, 2020. http://journals.socantscot.org/index.php/psas/article/view/6077.