1. Audi, R. 2003 Epistemology. A Contemporary Introduction to the Theory of Knowledge (Second edition). London: Routledge.
2. Amesbury Barrow 51: excavation 1960;Ashbee;Wiltshire Archaeological and Natural History Magazine,1978
3. Stonehenge: its possible noncompletion, slighting and dilapidation;Ashbee;Wiltshire Archaeological and Natural History Magazine,1998
4. Silbury Hill, 1969-70;Atkinson;Antiquity,1970
5. Atkinson, R.J.C. 1979 Stonehenge (Revised edition). Harmondsworth: Penguin Books.