JERVISE, Andrew; ORMISTON, William; ROBERTSON, Joseph. Remarks on the Round Tower of Brechin. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 3, p. 28–35, 1862. DOI: 10.9750/PSAS.003.28.35. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/4483. Acesso em: 23 may. 2024.