ARMSTRONG, William Bruce. Two Papers Relating to the Export of Coals from Scotland, 1596 and 1614. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 24, p. 474–477, 1890. DOI: 10.9750/PSAS.024.474.477. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/6375. Acesso em: 23 apr. 2024.