World Book Co., Yonkers, New York, 1946.
Klüver, Heinrich,
Mescal and Mechanisms of Hallucinations,
University of Chicago
Knight, Richard Payne,
The Symbolical Language of Ancient Art and Mythology,
J. W. Bouton, New York, 1876.
Koffka, Kurt,
Harcourt, Brace & Co., New York, 1935.
Köhler, Wolfgang,
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