Oxford University Press, New York, 1937.

Spalding, J. R., R. F. Archuleta, and L. N. Holland, “Influence of the Visible Color Spectrum on Activity in Mice,” a study performed under the auspices of the U.S. Atomic Energy Commission.

Spiegelberg, Friedrich,

The Bible of the World, Viking Press,

New York, 1939.

Stevens, Ernest J.,

Science of Colors and Rhythm,

published by the author, San Francisco, 1924.

Stratton, George Malcolm,

Theophrastus and the Greek Physiological Psychology before Aristotle,

Bog aan la aqoon