EDWARDS, Kevin J.; RALSTON, Ian. Scotland After the Ice Age: Environment, Archaeology and History, 8000 BC - AD 1000. [s.l.]: Edinburgh University Press 356 s. Dostupné online. ISBN978-0-7486-1736-4. (anglicky) Google-Books-ID: hcoCand_S_IC.
megalithic.co.uk
C. Michael Hogan, Elsick Mounth, The Megalithic Portal, ed. A. Burnham. [1]