Koestler, Arthur, 1905- The act of creation / Arthur Koestler. - New York : Macmillan, [1964]. - 751 p. illus. ; 24 cm. - 155.3 . Bibliography: p. 709-728. Subjects--Topical Terms: Creative thinking.Creation (Literary, artistic, etc.)Creative ability. Dewey Class. No.: 155.3