1. Geschichte der Farbenlehre, Artemis Verlag, Zurich, 1962.
2. Art of Ancient Egypt, Harry N. Abrams, Inc., New York, 1968.
3. The Origin of Consciousness in the Breakdown of the Bicameral Mind, Houghton Mifflin, Boston, 1976.
4. An Egyptian Hieroglyphic Dictionary, in Two Volumes, Dover, New York, 1978.
5. The Mummy, Causeway Books, New York, 1974.