1. Licht, S. (ed.): The Occupational Therapy Source Book. Baltimore: The Williams & Wilckins Co. 1948.
2. Brigham, A.: Moral treatment. Amer. J. Insan.4, 1?15 (1847).
3. Brown, E., Jaques, E.: Glacier Project Papers. London: Heinemann 1965.
4. Jaques, E.: Equitable Payment. London: Penguin Books 1967.
5. Miller, D. C., Form, W. H.: Industrial Sociology. New York: Harper 1951.