1. Thom, A., J. Br. astr. Ass., 64, 402–3 (1954).
2. Thom, A., Megalithic Lunar Observatories, 36, 37 (Oxford University Press, London, 1971).
3. Thom, A., Megalithic Sites in Britain, 151–154 (Oxford University Press, London, 1967).
4. ibid, 97.
5. Thom, A., Vistas Astr., 7, 26 (1966).