References
- Richardson , J. A. 1955 . The Mentally Subnormal Child . Slow Learning Child , 2 Nov. : 77
- Ibid p. 83.
- Schonell , F. J. , Richardson , J. A. and McConnel , T. S. 1958 . The Subnormal Child at Home , London : Macmillan .
- Clarke , A. M. and Clarke , A. D. B. 1958 . Mental Deficiency : The Changing Outlook Methuen
- Gesell , A. 1925 . The Mental Growth of the Pre‐School Child , New York : Macmillan .
- Gesell , A. and Amatruda , C. S. 1941 . Developmental Diagnosis : Normal and Abnormal Child Development Hoeber
- Griffiths , R. 1954 . The Abilities of Babies , U.L.P. .
- Illingworth , R. S. 1960 . The Development of the Infant and Young Child, Normal and Abnormal , Livingstone Press .