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Concerning the Spiritual in Art,

Wittenborn, Schultz, New York, 1947.

Katz, David,

The World of Colour,

Kegan Paul, Trench, Trubner & Co., London, 1935.

Katz, David,

Gestalt

Ronald Press, New York, 1950.

Kilner, Walter J.,

Bog aan la aqoon