“Notes of the Brochs or Pictish Towers of Mousa, Clickemin, &c., in Shetland, illustrative of part of the Series of Plans and Sections deposited in the Library of the Society”, arch-scot, vol. 5, pp. 199–212, Nov. 1891, Accessed: Dec. 11, 2025. [Online]. Available: https://journals.socantscot.org/index.php/arch-scot/article/view/316