Christie, C., A. Sheridan, T. Cowie, N. Woodley, J. Lochrie, J. Franklin, L. Bailey, and T. Holden. “Chalcolithic-Early Bronze Age Activity”. Scottish Archaeological Internet Reports, Vol. 91, June 2020, pp. 13-16, http://journals.socantscot.org/index.php/sair/article/view/10326.