1. The Education Acts 1981 and 1993;Department of Education and Science,1993
2. The Effectiveness of Early Intervention for At Risk and Handicapped Children;Guralnick,1978
3. Report;Joint Working Party on Medical Services for Children,1992
4. The Developmental Progress of Infants and Young Children;Sheridan,1975
5. The Abilities of Young Children;Griffiths,1970