- Andrews, Ted. Animal-Speak: The Spiritual & Magical Powers of Creatures Great & Small. Llewellyn Publications, 1996. (ISBN 0.87542.0281)
- Cunningham, Scott. Cunningham’s Encyclopedia of Crystal, Gem & Metal Magic. Llewellyn Publications, 1988. (ISBN 0.87542.126.1)
- Gimbutas, Marija Alseikaite. The Language of the Goddess: Unearthing the Hidden Symbols of Western Civilization. HarperCollins Publishers, 1989. (ISBN 0.06.250418.5)
- Hall, Manly P. The Secret Teachings of All Ages: An Encyclopedic Outline of Masonic, Hermetic, Qabbalistic & Rosicrucian Symbolical Philosophy. The Philosophical Research Society Inc., 1988. (ISBN 0.89314.830.X)
- Melody. Love Is in the Earth — Mineralogical Pictorial: Treasures of the Earth. Earth–Love Publishing House, Ltd., 1993. (ISBN 0.9628190.26)
- Melody. Love Is in the Earth: A Kaleidoscope of Crystals — THE Reference Book Describing the Metaphysical Properties of the Mineral Kingdom. Earth–Love Publishing House, Ltd., 1991. (ISBN 0.9628190.0.X)
- Sperling, Renate. The Essences of Gemstones. Blue Star Communications, 1995 (ISBN 1885394128)
- Walker, Barbara. The Woman’s Dictionary of Symbols and Sacred Objects. HarperCollins Publishers, 1988. (ISBN 0.06.250923.3)
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