A Treatise on Optics,

Lea & Blanchard, Philadelphia, 1838.

Brown, Barbara B.,

New Mind, New Body,

Harper & Row, New York, 1974.

Budge, E. A. Wallis,

Amulets and Superstitions,

Oxford University Press, London, 1930.

Budge, E. A. Wallis,

The Book of the Dead,

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