BURL, H A W. The recumbent stone circles of north-east Scotland. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 102, p. 56–81, 1973. DOI: 10.9750/PSAS.102.56.81. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8767. Acesso em: 3 may. 2024.