THOMAS, F W L. Shetland Ballad. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 1, p. 86–89, 1852. DOI: 10.9750/PSAS.001.86.89. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/3924. Acesso em: 26 apr. 2024.