COLES, John M. Scottish swan’s-neck sunflower pins. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 92, p. 1–9, 1961. DOI: 10.9750/PSAS.092.1.9. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8570. Acesso em: 7 may. 2024.