Excavations at Newark Castle, Port Glasgow, 1984 and 1997. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 128, p. 905–921, 1999. DOI: 10.9750/PSAS.128.905.921. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/psas/article/view/10031. Acesso em: 1 oct. 2025.