1. in “Proceedings of the Analogy Symposium,”;Polanyi,1966
2. “Meno”,1961
3. “Essay Concerning the Understanding, Knowledge, Opinion and Assent”;Locke,1931
4. J. H. Fabre, “Les merveilles de I'instinct chez les insectes.” Paris, 1913
5. “African Genesis,”;Ardrey,1961