The Fourth Dimension: Sacred Geometry, Alchemy and Mathematics, by Rudolf Steiner, republished by Anthroposophic Press, 2001
The Elixir of Immortality: A Modern-Day Alchemist’s Discovery of the Philosophers Stone, Inner Traditions, 2009
The Celtic Lunar Zodiac: How To Interpret Your Moon Sign, illustrated by Margaret Walty, Llewellyn, 1998