Clarke, A.D.B. , Lewis, M.M. <br/><br/>
Learning Speech and Thought in the Mentally Retarded: Proceedings of Symposia 4 and 5 Held at the Middlesex Hospital Medical Sessions on 31st Oct1969 and 20th March 1970, Under the Auspices of the Institute for Research in the Mental Retardation, London 

 - 83p. 
<br/><br/><label>Dewey Class. No.: </label>371.92 CLA L