الألوان والاستجابات البشرية

Random House, New York, 1969.

Lutz, Frank E., “'Invisible’ Colors of Flowers and Butterflies,”

Natural History,

Vol. XXXIII, No. 6, November/December 1933.

Maclay, W. S. and E. Guttman, “Mescaline Hallucinations in Artists,”

Archives Neurology and

January 1941.

Matthaei, Rupprecht,

Goethe’s Color Theory,

Van Nostrand Reinhold Co., New York, 1970.

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