Laing, David, and Daniel Wilson. “An Account of Alexander Gordon, A.M., Author of the Itinerarium Septentrionale, 1726: With Additional Notes Concerning Gordon and His Works”. Proceedings of the Society of Antiquaries of Scotland 10 (November 30, 1875): 363–382. Accessed April 25, 2024. https://journals.socantscot.org/index.php/psas/article/view/5680.