CRAW, James Hewat. The So-called Catrail. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 58, p. 40–44, 1924. DOI: 10.9750/PSAS.058.40.44. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/7594. Acesso em: 6 may. 2024.