1. R. Descartes,?uvres (C. Adam and P. Tannery, Editors, Libraire Philosophique, Paris, 1967), Vol. XI, p. 119 ff.
2. Thomas H. Huxley,Method and Results (Vol. 1 ofSelected Works, Appleton and Co., New York, 1902).
3. P. B. Medawar,The Art of the Soluble (Methuen, London, 1967).
4. B. Petermann,Gestaltslehre (J. A. Barth, Leipzig, 1929); W. Köhler,The Task of Gestalt Psychology (Princeton University Press, 1969).
5. S. L. Jaki,The Relevance of Physics (University of Chicago Press, Chicago, 1966), Chapter VII.