SPEARMAN, R M. Excavation at 17-21 Castle Street, Forfar, 1979. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 112, p. 455–464, 1983. DOI: 10.9750/PSAS.112.437.454. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9091. Acesso em: 6 may. 2024.