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,

Shafi da ba'a sani ba