Mystery of Mandalas
by Heita Copony. Theosophical Publishing House, 1989. Inspirational pictures and stories. You can also visit Heita's Web site. Out of Print

The Alchemical Mandala
by Adam McClean, Phanes Press.

The history of mandalas in the West, including alchemy, the Hermetic tradition, & Kabbala.

(Originally published as The Western Mandala, Hermetic Research Series, Edinburgh, 1983.)

Celtic Mandalas
by Courtney Davis, Text by Helena Paterson, Blandford, London, 1994.

A collaboration of Celt inspired designs and text.

Illuminations of Hildegard of Bingen
Text by Hildegard of Bingen, with commentary by Matthew Fox, Bear & Company, Santa Fe, 1985.

The titles of her illuminations "Egg of the Universe", "The Cosmic Wheel", & "Cultivating the Cosmic Tree" point to the mandala nature of her work.

The Medicine Wheel: Earth Astrology
by Sun Bear and Wabun, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1980.

Another classic. Includes instructions on constructing a medicine wheel.

Medicine Wheel Ceremonies
by Vicki May and C.V. Rodberg, Naturegraph Publishers, CA, 1996.

Diagrams and ceremony cards, etc.

Rose Windows
by Painton Cowen, Chronicle Books, San Francisco, 1979.

Incredible color plates of gothic rose windows, good information on sacred geometry.

Sacred Geometry: Philosophy and Practice
by Robert Lawlor, Thames and Hudson, London, 1982.

Another useful resource.

Time Stands Still: New Light on Megalithic Science
by Keith Critchlow, St. Martin's Press, New York, 1982.

Discusses the geometry and meaning of stone circles (such as Stonehenge). Filled with great diagrams and color photographs. Out of Print

Western Mandalas of Transformation: Astrological & Qabalistic Talismans & Tattwas
(Llewellyn's Golden Dawn Series), by A. L. Soror, Llewellyn Publications, 1996.