Blatner, David, 1997. π (pi). London: Penguin Books. no ISBN. Among other things, this book gives you the value of pi - "a transcendental figure without resolution" - to many more places than than you would ever want to know. This is a good read for anyone wanting to learn more about this fundamental number that is so critical in sacred geometry.
Critchlow, Keith, 1979. Time Stands Still: New Light on Megalithic Science. London: Gordon Fraser. Great pictures. Lots of sacred geometry.
Doczi, György, 1993. The Power of Limits: Proportional Harmonies in Nature, Art and Architecture. Boulder & London: Shambhala. A fantastic book that ties sacred geometry in to Nature and ancient sacred sites. Great illustrations.
Garland, Trudi Hammel, 1987. Fascinating Fibonaccis. Palo Alto, CA, USA: Dale Seymour Publications. About phi, or the ratio of 1.618:1. An easy fun read. A quick way to get a handle on phi.
Gleick, James, 1987. Chaos: Making a New Science. New York: Viking Penguin. Chaos and geomancy have a great to do with each other. Learn more about chaos.
Lawlor, Robert, 1982. Sacred Geometry. New York: Crossroads. There have been editions by several publishers. This is a good basic workbook for sacred geometry. If you read it, do the exercises - you would otherwise be wasting your time. Well worth the effort. Several mistakes though.
Maor, Eli, 1994. e: The Story of a Number. Chichester, West Sussex & Princeton, New Jersey: Princeton University Press. ISBN 0 691 05854 7. Epsilon, or 2.72+, was a value discovered by John Napier in the seventeenth century, he used it as the basis for his table of logarithms. This transcendental number is said by some to be the number of stones in the Chartres labyrinth (272), and the number of days of the average human baby's gestation period. 2.72 is also the length in feet of Alexander Thom's Megalithic Yard.
McClain, Ernest G., 1978. The Myth of Invariance. Boulder & London: Shambhala. The origin of the Gods, mathematics and music from the Rig Veda to Plato. Great sacred geometry. A think book.
Michell, John, with Alan Brown. 2009. How the World Is Made: The Story of Creation According to Sacred Geometry. London: Thames & Hudson. ISBN 9 780500 515105. John's final book before his death in 2009. Many magnificent full colour drawings by John, A must read/must have in any Sacred Geometry library.
O'Sullivan, Muiris, Dr., 1993. Megalithic Art in Ireland. Dublin: Town House and Country House. ISBN 0-946172-36-6. Sequencing of Irish passage graves based on development in art.
Schneider, Michael S., 1995. A Beginner's Guide to Constructing the Universe: The Mathematical Archetypes of Nature, Art, and Science. New York: Harper Perennial. A voyage from one to ten. An important recent addition to this field. Introduction by John Michell.
Schwenk, Theodor, 1976. Sensitive Chaos: The Creation of Flowing Forms in Water. New York: Schocken Books. Water - one place where chaos and geomancy meet.
Skinner, Stephen. 2009. Sacred Geometry: Deciphering the Code. New York: Sterling. ISBN 978-1-4027-6582-7. In addition to good material on Sacred Geometry, there is all kinds of other information that would interest any Earth Mystery enthusiast.
Thomas, N. L., 1988. Irish Symbols of 3500 BC. Dublin: Mercier Press. ISBN 0-85342-856-5.
Thom, Archibald, 1967. Megalithic Sites in Britain. London: Oxford Univ Press. The seminal work of our most important astronomer and geometer. Notice the geometry of Britain's stone rings.
_____, 1971. Megalithic Lunar Observatories. London: Oxford Univ Press. Thom turns his attention from Solar to Lunar temples in Northern Europe - primarily Britain.
_____ & A.S. Thom, 1978. Megalithic Remains in Britain and Brittany. London: Oxford Univ Press. Archibald Thom's final book.