Bain, J. “Notices of the Unprinted Chartulary of the Priory of St Andrew of Northampton, and of Charters by the Scottish Kings and Princes, As Earls of Huntingdon, and Other Nobles, Contained Therein”. Proceedings of the Society of Antiquaries of Scotland, Vol. 14, Nov. 1880, pp. 338-46, http://journals.socantscot.org/index.php/psas/article/view/5933.