ROBERTSON, Thomas. Letter from Thomas Robertson, Esq., to the Earl of Buchan, respecting the Discovery of a Stone Coffin at Arbroath, supposed to contain the Remains of King William the Lyon. Archaeologia Scotica, [S. l.], v. 3, p. 297–298, 1832. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/240. Acesso em: 1 may. 2024.