References
- BUTLER, N. R., and ALBERMAN, E. D. (1969). Perinatal Problem. Livingstone, Edinburgh.
- BUTLER, N. R., PECKHAM, C. S. and SHERIDAN, M. D. (1973). ļSpeech defects in children aged seven yearsĽ. B.M.J. Vol. 1253.
- DAVIE, R., BUTLER, N. R. and GOLDSTEIN, H. (1973). From Birth to Seven. Longmans, London.
- SHERMAN, M. D. (1948). The Child's Hearing for Speech. Methuen, London.