References
- Furth H. G. Thinking without language. Free Press., New York 1966
- Schools Council. Society and the young school leaver. Working Party II. H.M.S.O., London 1967
- Stott D. H. The social adjustment of children. London University Press., London 1963
- Thurstone I. L., Thurstone T. G. The S.R.A. primary mental abilities test handbook. Science research associates., Chicago 1958
- Wiseman S. Education and environment. Manchester University Press., Manchester 1964