Craw, John Hewat. “On a Jet Necklace from a Cist at Poltalloch, Argyll: Including Appendices”. Proceedings of the Society of Antiquaries of Scotland 63 (November 30, 1929): 154–189. Accessed December 9, 2024. https://journals.socantscot.org/index.php/psas/article/view/7755.