Simpson, H F Morland. “Notes on a Swedish Staff-Calendar, Presented to the Museum by The Hon. John Abercrombie, F.S.A. Scot., Dated 1710”. Proceedings of the Society of Antiquaries of Scotland 29 (November 30, 1895): 234–240. Accessed April 27, 2024. https://journals.socantscot.org/index.php/psas/article/view/6590.