Listed below are many of the books used during research for The Stonehenge Observatory. You can find most for sale secondhand on eBay or Amazon. Some of the very old texts are available online through specialist web sites including Project Gutenberg and The Internet Sacred Text Archive. It's also worth checking Google Books and Amazon for digitized versions.
by R. J. C. Atkinson
The text on Stonehenge. Written before the invention of the metric unit and as British as it can get. Atkinson even compares the Ditch to a string of badly made sausages, the Cursus to a rasher of back bacon, and the midsummer sunrise over the heel stone to a finger of buttered toast poked in the golden yolk of a poached egg (OK, I added the last two myself).
by Christopher Chippindale
The essential companion to Atkinson's Stonehenge. An absolutely 'no nonsense' book full of the history of Stonehenge from the very first written records to recent times. Superbly illustrated throughout. Almost as good as that other book, what's it called, the Stonehenge Observatory?
by R. Cleal, R. Montague, K.E. Walker
The collated data from 20th century excavations at Stonehenge, including a re-analysis of the results from radiocarbon dating. A must for anyone wishing to undertake an appraisal of the site. Very expensive, so try and borrow a copy from someone (I did). Buy some Post-It labels while you're at it to keep track of the subjects.
by Gerald S. Hawkins
He might be wrong about the designer's original intention but there is no doubting the subsequent positioning of the Station Stones and others to align with Sun and Moon events. Skip over the introduction to the site (he does) and get right to the analysis. Proof that archeology is a closed-shop.
by C. A. Newham
Newham published this booklet dealing with the alignments at Stonehenge at the same time as Hawkins. His assessment of the post holes in the Avenue was recognized by Hawkins as significant. Easy to understand with only High School math. Occasionally available from eBay.
by Fernand Niel (translated)
One of the most thought-provoking books on Stonehenge, Niel isn't afraid to venture where others fear to tread - probably because he was foreign and couldn't read the "Keep Off" signs. Try eBay or Amazon for a secondhand copy.
by Sir Norman Lockyer
Meticulous observation of the midsummer sunrise event from the turn of the 20th century. Not by Sir Norman himself of course. Waiting around on Salisbury Plain from four in the morning - WHAT! Damn it sir, I accompanied Mr Payn the first three mornings, but when the bloody object failed to show on the third - well, I remarked to the good gentleman that he should maybe make an appointment. Read it here.
by Charles Knight
An old book from 1845 with an emphasis on the Druids. Includes the author's lovely sketches of various landmarks. The (incomplete) transcription of this and many other old books appears to be the work of one man, Liam Quin. Available here.
by R. S. Newall
Great little booklet if only for the large fold-out plan of the site. Includes a lot of facts not included in the plagiarization of Atkinson's Stonehenge, but then it was in publication before. Easily available as original or in reprint from eBay.
by Aubrey Burl
Subtitled 'A Complete History and Archaeology of the World's Most Enigmatic Stone Circle'. So what is it Aubrey - Brief or Complete? The answer is a mélange of the same old history, legend, theory and descriptions, this time with a dash of savoir-faire from Burl who will go to any extremes to prove Stonehenge wasn't built by the Brits. Bet he supports Arsenal.
by Mike Pitts
If you didn't know better you'd think this a sequel to Lord of the Rings, and not just from the title. With people like this at the helm there's no chance for common sense in ancient history. Throughout his work runs the clear subtext, 'archaeologists know best', be it a native from Madagascar or ex-astronomer.
by John North
At last, an end to the speculation and amateur theorizing over the site's purpose. Well, that's one Amazon customer's take on it at least (probably Patrick Moore). 600 pages packed full of the same regurgitated information, but this time wrapped in more speculative mathematics than you can shake a hazel-twig at. Professional theorizing at its best.
by Frank Stevens
Possibly the earliest written evidence of the current archeological interpretation of the site as a temple built in the late British Neolithic. Not much use today though. Read it here.
by Anthony Johnson
It's one thing to ignore small points in the construction of Stonehenge (like how did they get the top perfectly level) and quite another to introduce unnecessary complexity simply to prove how it could have been designed without a means to measure. If anyone but an archaeologist had proposed this they'd be ridiculed. Now, if you really want to know how to make a lozenge ...
by Rodney Castleden
Hats-off to Rodney for attempting to explain life in a world with bugger-all written record (archeologists get paid to do it all the time of course). Consequently the book is full of conjecture (possibly, could, might, would have) because we know very little about what they were up to and certainly not what they were thinking. A fictional account at best.