REID, Alan. The Churchyard Memorials of Lasswade and Pentland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 41, p. 81–99, 1907. DOI: 10.9750/PSAS.041.81.99. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7078. Acesso em: 5 may. 2024.