References
- Irwin O. C. Speech development in the young child: 2. Some factors related to the speech development of the infant and young child. J. Speech Hear. Disorders 1952; 17: 267–279
- Furth H. G. Thinking without Language: Psychological Implications of Deafness. The Free Press, New York 1966
- Luria A. R. The Role of Speech in the Regulation of Normal and Abnormal Behaviour. Pergamon Press, London 1961
- McCarthy D. Language development in children. Manual of Child Psychology, L. Carmichael. Wiley, New York 1954; 492–630
- Piaget J. The Origin of Intelligence in the Child. Routledge and Kegan Paul, London 1953
- Reynell J. K. Reynell Developmental Language Scales. Manual. National Foundation for Educational Research in England and Wales, (in press)
- Singh J. A. L., Slough Zingg R. M. Wolf Children and Feral Man. Harper, New York 1942
- Vygotski L. S. Thought and Language. M.I.T. Press, Cambridge, Mass. 1962