MORRIS, Ronald W B. The cup-and-ring marks and similar sculptures of Scotland: a survey of the southern counties, Part II. Proceedings of the Society of Antiquaries of Scotland, [S. l.], v. 100, p. 47–78, 1969. DOI: 10.9750/PSAS.100.47.78. Disponível em: https://journals.socantscot.org/index.php/psas/article/view/8722. Acesso em: 18 apr. 2024.