Curle, J., and H. James. “Notes on Two Brochs Recently Discovered at Bow, Midlothian, and Torwoodlee, Selkirkshire”. Proceedings of the Society of Antiquaries of Scotland, Vol. 26, Nov. 1892, pp. 68-84, http://journals.socantscot.org/index.php/psas/article/view/6472.