Scientific American,

December 1970.

Luckiesh, M.,

The Science of Seeing,

D. Van Nostrand Co., New York, 1937.

Luckiesh, M.,

Light, Vision, and Seeing,

D. Van Nostrand Co., New York, 1944.

Lüscher, Max,

The Lüscher Color Test,

Bog aan la aqoon