Learning, speech and thought in the mentally retarded ed by A D B Clarke and M M Lewis 

 - London  Butterworths         1972 
<br/><br/><label>Standard No.: </label>83,738 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PSYCHOLOGY
<br/><br/><label>Dewey Class. No.: </label>S62:4-682p73,N69, L2