1. Stone circles: Megalithic mathematics or Neolithic nonsense?;Angell;Mathematical Gazette,1976
2. Megalithic mathematics: Ancient Almanacs or Neolithic nonsense?;Angell;Bulletin of the Institute of Mathematical Application,1978
3. Prehistoric Cornwall;Barnatt,1982
4. Stone circles and Megalithic mathematics;Barnatt,1984
5. The Stone Circles of the British Isles;Burl,1976