BARCLAY, Gordon J. The Cowie Line: a Second World War ’stop line’ west of Stonehaven, Aberdeenshire. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 135, p. 119–161, 2006. DOI: 10.9750/PSAS.135.119.161. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/9670. Acesso em: 19 apr. 2024.