Syme, John. 1793. “Letter from the Countess Dowager of Nithsdale to Her Sister, the Countess of Traquair, Giving an Account of the Earl’s Escape Out of the Tower in 1716”. Archaeologia Scotica 1 (November):523-38. https://journals.socantscot.org/index.php/arch-scot/article/view/352.