Campbell, D., & Cayce, C. T. (1989). Edgar Cayce on the power of color, stones, and crystals (Warner Books edition.). Warner Books.
Citace podle Chicago (17th ed.)Campbell, Dan, a Charles Thomas Cayce. Edgar Cayce on the Power of Color, Stones, and Crystals. Warner Books edition. New York: Warner Books, 1989.
Citace podle MLA (9th ed.)Campbell, Dan, a Charles Thomas Cayce. Edgar Cayce on the Power of Color, Stones, and Crystals. Warner Books edition. Warner Books, 1989.
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