PETLEY, Charles Carter. A Short Account of some Carved Stones in Ross-shire, accompanied with a series of Outline Engravings. Archaeologia Scotica, [S. l.], v. 4, p. 345–352, 1858. Disponível em: https://journals.socantscot.org/index.php/arch-scot/article/view/303. Acesso em: 19 may. 2024.