DavieR., ButlerN., & GoldsteinH. (1972) From Birth to Seven: the second report of the National Child Development Study (1958 cohort).Longman, London
2.
Department of Education and Science (1975) Social Trends6, 144; Table 8. 1
3.
Department of Health and Social Security (1971) Better Services for the Mentally Handicapped. Cmnd 4683. HMSO, London
4.
Department of Health and Social Security, (1972) The Incidence and Causes of Blindness in England and Wales 1963–1968. Reports on Public Health and Medical Subjects No 128. HMSO, London
5.
HarrisA.I. (1971) Handicapped and Impaired in Great Britain, Part 1.HMSO, London
6.
HendersonJ.L. (1961) Cerebral Palsy in Childhood and Adolescence.Livingstone, Edinburgh & London
7.
SpainB. (1970) GLC Intelligence Unit Quarterly Bulletin12, 5–12.
8.
WeatherallJ.A.C., & HaskeyJ.C. (1976) British Medical Bulletin32, 39–44.
9.
WeatherallJ.A.C., & WhiteG.C. (1976) In: Studies on Medical and Population Subjects 31.HMSO, London
10.
WoodP.H.N. (1975) Document WHO/ICD9/REV.CONF/75.15.World Health Organization, Geneva