Mercer, Roger J, Gordon J Barclay, D Jordan, and Christopher J Russell-White. “The Neolithic Henge-Type Enclosure at Balfarg: A Re-Assessment of the Evidence for an Incomplete Ditch Circuit”. Proceedings of the Society of Antiquaries of Scotland 118 (November 30, 1989): 61–67. Accessed April 20, 2024. https://journals.socantscot.org/index.php/psas/article/view/9322.