Various Books I have and would recommend on the subject
The Rollright Stones - The Stonehenge of Oxfordshire ..............Henry W Taught ......................1907
Long Barrows of the Cotswolds........................................... ...O.G.S Crawford........................1927
Prehistoric Avebury............................................................... Aubrey Burl .............................1979
Riddles in the British Landscape.............................................. Richard Muir............................1981
Ancient Mysteries of Britain.....................................................Janet & Colin Board.................1986
Rings of Stone........................................................................Aubrey Burl.......................... ..1979
The Ancient Burial Mounds of England.....................................L.V.Grinsell.............................1953
Megalithic Sites in Britain.................................................... ....A.Thom..................................1979
Stone Circles of Cumbria..................................................... ...John Waterhouse.....................1985
Monumenta Britannica Parts 1 & 2...........................................John Aubrey...........................1981